Supply Chain Glossary

A method of segmenting inventory into classes by value or importance, typically with A items representing the small fraction of SKUs that drive most of the value. It focuses management attention where it matters most.

Accessorial charges are fees carriers add for services beyond standard dock-to-dock pickup and delivery, such as liftgate service, residential delivery, inside delivery, redelivery, or driver detention. They appear as line items on top of the base freight rate.

Advanced Planning and Scheduling (APS) software creates feasible, optimized production and supply plans by considering material availability, machine capacity, and demand priorities simultaneously, something basic MRP cannot do.

An agile supply chain is designed to respond quickly to unpredictable changes in demand or supply, prioritizing speed and flexibility over lowest unit cost. It suits volatile markets and short product life cycles.

Air freight is the transport of cargo by aircraft, either in dedicated freighters or in the belly holds of passenger planes. It is the fastest long-distance mode and also the most expensive, priced per kilogram of chargeable weight.

The process of assigning available inventory to competing demands, such as customer orders, channels, or locations, especially when supply is insufficient to cover everything. It decides who gets stock when there is not enough for everyone.

Stock built ahead of a known future event such as a seasonal peak, promotion, price increase, or planned plant shutdown. It smooths supply when future demand or supply is predictably uneven.

An Application Programming Interface (API) is a defined way for one software system to request data or actions from another in real time, forming the connective tissue of modern supply chain tech stacks.

Artificial intelligence in supply chain applies machine learning, optimization, and increasingly generative and agentic AI to forecasting, planning, logistics, and exception management tasks that previously required manual analysis.

ASCM is the world's largest nonprofit association for supply chain professionals and the organization behind the APICS certifications, including CPIM, CSCP, and CLTD. It provides education, research, standards, and a global professional community.

An Automated Storage and Retrieval System (AS/RS) uses cranes, shuttles, or robots operating in dense racking to store and retrieve pallets, cases, or totes automatically, without forklifts or manual reach.

Autonomous Mobile Robots (AMRs) are self-navigating warehouse robots that use sensors and onboard intelligence to move goods around a facility, dynamically routing around people and obstacles without fixed guide paths.

The uncommitted portion of current and planned inventory that can be promised to new customer orders. ATP tells sales what can be delivered, and when, without stealing from existing commitments.

Back scheduling (backward scheduling) is a planning method that starts from a job's required due date and works backward through each operation's lead time to find the latest possible start date for every step.

A customer order, or portion of one, accepted for fulfillment despite the item being out of stock, to be shipped when inventory becomes available. Managing backorders means tracking, prioritizing, and clearing this unmet demand.

Barcode scanning is the use of optical scanners to read printed codes (UPC, Code 128, QR, GS1 labels) that identify items, cartons, locations, and shipments, confirming every physical move in the system.

Big data refers to datasets too large, fast-moving, or varied for traditional tools to handle (characterized by volume, velocity, and variety) such as the point-of-sale, telematics, sensor, and transactional streams modern supply chains generate.

Big data analytics is the practice of collecting and analyzing very large, fast-moving, and varied datasets (POS transactions, sensor streams, telematics pings, clickstream) to find patterns ordinary reporting tools would miss.

A bill of lading is the legal document issued by a carrier that serves as a receipt for goods, evidence of the transport contract, and in ocean shipping, a document of title to the cargo. It travels with, and controls, the shipment.

A long-term purchase order that commits to buying a total quantity or value from a supplier over a period, with individual releases scheduled against it as needed.

Block scheduling is a capacity scheduling technique that assigns whole blocks of time (such as a shift, day, or week) to a job or product group at a work center, rather than scheduling exact start and stop times for each operation.

Blockchain is a distributed digital ledger that records transactions in cryptographically linked blocks across many computers, making entries effectively tamper-proof without requiring a central authority to maintain trust.

Blockchain in supply chain uses a shared, tamper-evident digital ledger so multiple trading partners can record and verify transactions (provenance, custody, certifications) without trusting a single central party.

A bottleneck is the resource or process step with the least capacity in a system, which limits the output of the whole chain. Total throughput can never exceed the bottleneck's rate.

Break-even analysis is a calculation that finds the sales volume at which total revenue equals total cost, computed as fixed costs divided by the contribution margin per unit, the point beyond which each additional unit generates profit.

Inventory held specifically to absorb shocks, whether from demand surges, supply delays, or process disruptions. The term is often used interchangeably with safety stock, though it can refer to any protective stock positioned in a process or network.

The bullwhip effect is the amplification of demand variability as orders move upstream in a supply chain, so small changes at the consumer level become large swings for manufacturers and raw material suppliers.

Capacity planning is the process of determining the production, storage, and labor resources needed to meet expected demand, and deciding how to close gaps between required and available capacity.

A carbon footprint is the total greenhouse gas emissions caused by a product, shipment, company, or supply chain, expressed in tonnes of CO2 equivalent (CO2e) across direct operations and purchased energy, and often the full value chain.

A carbon handprint is the positive climate impact a product or company creates by helping others avoid or reduce emissions, the beneficial mirror image of a carbon footprint, which measures the harm caused.

A carrier is a company that physically transports freight, such as a trucking company, ocean line, airline, or railroad. Carriers contrast with intermediaries like brokers and forwarders, who arrange transport but do not operate the equipment.

The cash-to-cash cycle measures the days between paying suppliers for materials and collecting cash from customers for the finished product. It equals days of inventory plus days of receivables minus days of payables.

Organizing procurement around groups of similar goods or services, with each category managed by a dedicated strategy covering suppliers, pricing, and risk.

The CLTD is an ASCM certification covering logistics strategy, transportation modes, warehousing, distribution networks, and global trade. It is aimed at professionals who move, store, and deliver goods.

The CPIM is an ASCM certification focused on production planning, inventory management, scheduling, and internal supply chain operations. It is one of the most widely held credentials among planners and inventory professionals.

The CPSM is the Institute for Supply Management's flagship certification for procurement and supply management professionals. It covers sourcing, negotiation, supplier relationship management, and category strategy.

The CSCP is a globally recognized certification from ASCM that validates end-to-end supply chain knowledge, from supplier through to customer. It covers planning, sourcing, logistics, and technology across the full supply chain network.

CIF is an Incoterm for sea freight under which the seller pays for ocean freight and minimum insurance to the destination port, but risk transfers to the buyer once goods are loaded at origin. The buyer handles import clearance and delivery from the port.

A circular supply chain keeps products and materials in use through return, repair, refurbishment, remanufacturing, and recycling, replacing the traditional linear take-make-dispose model.

Cloud computing delivers computing power, storage, and applications over the internet from shared data centers, letting companies run supply chain systems without owning and maintaining their own servers.

The cold chain is a temperature-controlled supply chain that keeps perishable or temperature-sensitive products, such as food, pharmaceuticals, and vaccines, within a specified temperature range from origin to final delivery, without interruption.

The consignee is the party to whom a shipment is addressed and delivered, named on the bill of lading as the receiver of the goods. The consignee is usually, but not always, the buyer.

Stock held at the customer's location but still owned by the supplier until it is used or sold. The customer pays only upon consumption, shifting inventory ownership cost upstream.

Container utilization measures how much of a container's available volume or weight capacity a shipment actually uses, usually expressed as a percentage. Higher utilization means lower freight cost per unit shipped.

Continuous Improvement is the ongoing, systematic effort to make processes better in small increments rather than through occasional large overhauls. In supply chain, it targets waste, errors, delays, and cost across every process.

An inventory policy where stock is monitored constantly and a fixed quantity is ordered whenever inventory falls to the reorder point. Order quantity is fixed while order timing varies with demand.

The discipline of creating, executing, and monitoring supplier contracts so that negotiated terms are actually delivered and risks are controlled through the contract's life.

Cost-volume-profit (CVP) analysis is a financial modeling technique that shows how profit responds to changes in sales volume, prices, variable costs, and fixed costs, extending break-even analysis into full what-if planning.

CSCMP is a global professional association focused on supply chain management education, research, and networking. It publishes the annual State of Logistics Report and administers the SCPro certification program.

A count point is a designated step in a production routing where completed units are counted and reported, so the system can track work-in-process quantities and backflush component usage without recording every individual operation.

Critical ratio is a dispatching priority index calculated as time remaining until due date divided by work time remaining; a ratio below 1.0 means the job is behind schedule, and lower ratios get worked first.

Cross-docking is a distribution practice where inbound goods are unloaded and moved directly to outbound vehicles with little or no storage in between. Products flow across the dock rather than being putaway into racking.

Customs clearance is the process of getting goods approved by government authorities to enter or leave a country, including filing declarations, paying duties and taxes, and satisfying any inspections. Goods cannot be delivered until clearance is complete.

The practice of counting a small subset of inventory locations or SKUs on a rotating schedule instead of shutting down for a full physical inventory. Discrepancies are investigated and corrected continuously.

The portion of inventory that is consumed and replenished through normal ordering cycles. It is the working stock that satisfies expected demand between replenishments.

Data integration is the work of connecting different systems (ERP, WMS, TMS, supplier and carrier platforms) so data flows between them automatically, accurately, and in a consistent format.

The number of days current inventory will last at the expected rate of demand, calculated as on-hand quantity divided by average daily usage. It expresses stock levels in time rather than units or dollars.

The average number of days inventory sits before being sold, calculated as average inventory divided by cost of goods sold, multiplied by 365. Also called days inventory outstanding.

DDP is an Incoterm under which the seller is responsible for delivering goods to the buyer's named location with all transport, export and import clearance, duties, and taxes paid. It places the maximum obligation on the seller.

Inventory with no recorded sales or usage over an extended period and no realistic expectation of future demand. It occupies space and capital while generating no return.

Buffer stock placed between dependent stages of a process or supply chain so each stage can operate independently. It prevents a disruption at one stage from immediately stopping the next.

Demand forecasting is the practice of estimating future customer demand using historical data, statistical models, and market knowledge. It provides the quantitative foundation for demand planning, inventory targets, and capacity decisions.

A Demand Planner forecasts future customer demand using historical data, statistical models, and input from sales and marketing. Their forecasts drive inventory, production, and purchasing decisions across the supply chain.

Demand planning is the process of predicting future customer demand and shaping it into a consensus plan that drives supply, inventory, and financial decisions. It combines statistical forecasting with market intelligence from sales, marketing, and customers.

Demand planning software generates statistical forecasts of future demand and gives planners a workspace to review, adjust, and agree on them with sales and finance.

Demand sensing uses near-real-time signals such as point-of-sale data, channel inventory, orders, and external data to detect what demand is doing right now, sharpening short-term forecasts beyond what historical models can see.

Actively influencing customer demand (through pricing, promotions, product substitution, or lead-time offers) so it better matches available supply.

The degree to which actual demand fluctuates around its average over time, commonly measured by standard deviation or the coefficient of variation. It is the primary driver of how much safety stock an item needs.

Demurrage is a charge assessed when a container stays at a port or rail terminal beyond its allotted free time before being picked up. It is billed per container per day and escalates the longer the box sits.

Detention is a charge for keeping a carrier's equipment, such as a container outside the terminal or a trailer at a dock, longer than the agreed free time. In trucking it also refers to fees for holding a driver beyond the allotted loading or unloading window.

A digital supply chain is one whose processes, decisions, and partner interactions run on connected data and software (sensors, integrated systems, analytics, and automation) rather than paper, phone calls, and disconnected spreadsheets.

A digital twin is a living virtual model of a physical supply chain (its nodes, flows, inventories, and constraints) kept in sync with real data so teams can test decisions virtually before making them.

Dimensional weight is a pricing method that converts a package's volume into an equivalent weight using a divisor, so carriers can charge for the space light, bulky shipments occupy. Carriers bill the greater of actual weight and dimensional weight.

A distribution center (DC) is a facility designed to receive goods in bulk and rapidly redistribute them to stores, customers, or other facilities. Unlike a long-term storage warehouse, a DC is optimized for throughput and order fulfillment.

Dock scheduling is the practice of assigning inbound and outbound trailers to specific dock doors and time slots, usually through an appointment system. It smooths workload at the warehouse and reduces carrier waiting time.

Drayage is the short-distance trucking of containers, typically between a port or rail ramp and a nearby warehouse, yard, or terminal. It is the connecting link at each end of an intermodal or ocean move.

A sourcing strategy that splits an item's volume between two qualified suppliers to balance cost leverage against supply risk.

Duties and tariffs are taxes governments levy on imported goods, usually calculated as a percentage of the goods' declared value based on their classification code and country of origin. They are a direct component of landed cost.

The use of electronic platforms to run purchasing processes, including requisitions, approvals, catalogs, purchase orders, and invoice matching, in a single digital workflow.

A price reduction a supplier offers in exchange for the buyer paying an invoice sooner than the standard due date, commonly expressed as terms like 2/10 net 30.

An echelon is one level in a distribution or supply network (such as plant, central warehouse, regional DC, or retail store) where inventory is held and decisions are made, with product flowing from one echelon to the next.

The order size that minimizes the combined cost of ordering and holding inventory. EOQ balances the fixed cost of placing orders against the cost of carrying stock.

Electronic Data Interchange (EDI) is the standardized, computer-to-computer exchange of business documents (purchase orders, invoices, ship notices) between trading partners without manual re-keying.

Enterprise Resource Planning (ERP) is integrated software that runs a company's core business processes (finance, purchasing, inventory, manufacturing, and order fulfillment) on a single shared database.

Stock held above what is needed to meet forecast demand plus planned buffers over a defined horizon. It is inventory that current plans cannot justify, even if the item itself still sells.

External setup time is the portion of a changeover that can be performed while the machine is still running the previous job (such as staging tools, fixtures, and materials) so it consumes no production capacity.

EXW is an Incoterm under which the seller simply makes goods available at its own premises, and the buyer is responsible for all transport, export and import clearance, and risk from that point onward. It places the minimum obligation on the seller.

First Expired, First Out: a picking rule that ships the stock with the earliest expiration date first, regardless of when it was received. It is the standard rotation method for perishable and dated goods.

First In, First Out: a rotation and valuation method where the oldest inventory is used or sold first. It keeps stock fresh physically and matches oldest costs to current sales in accounting.

The percentage of customer demand satisfied immediately from available stock, measured by units, lines, or complete orders. It captures how much demand you actually fulfilled, not just whether a stockout occurred.

FOB is an Incoterm for sea freight under which the seller delivers goods loaded on board the vessel at the origin port, at which point cost and risk transfer to the buyer. The buyer pays for ocean freight, insurance, and everything after loading.

Forward scheduling is a planning method that starts a job at the earliest available date (usually today) and adds each operation's lead time to project the earliest possible completion date.

A fourth-party logistics provider manages a shipper's entire logistics network, including coordinating and overseeing the 3PLs and carriers that physically move and store goods. It acts as a single control point for the whole supply chain rather than executing operations itself.

A free trade zone is a designated area where imported goods can be stored, processed, or assembled without immediately paying customs duties, which become due only if and when the goods enter the domestic market. In the US these are called foreign-trade zones (FTZs).

Freight class is a standardized rating system used in US less-than-truckload shipping that groups commodities into 18 classes, from 50 to 500, based on density, stowability, handling, and liability. Higher classes cost more to ship per pound.

Freight consolidation combines multiple smaller shipments into one larger load to reduce transportation cost per unit. Consolidated freight is later separated and delivered to individual destinations.

A freight forwarder is an intermediary that arranges international shipments on behalf of shippers, booking space with ocean and air carriers, preparing documentation, and coordinating handoffs along the route. Forwarders do not usually operate the ships or planes themselves.

A freight rate is the price a carrier charges to move a shipment between two points, quoted per container, per truckload, per hundredweight, or per kilogram depending on the mode. Rates vary with distance, capacity, commodity, and market conditions.

A fuel surcharge is a variable fee carriers add to freight bills to pass through changes in fuel prices, usually calculated from a published index such as the US Department of Energy diesel average. It rises and falls with the market rather than being renegotiated.

Full truckload shipping dedicates an entire trailer to one shipper's freight, moving directly from origin to destination without intermediate handling. It is typically used for shipments large enough to fill or nearly fill a 48- or 53-foot trailer.

A gateway work center is the first work center in a production routing, the point where a manufacturing order enters the shop floor and its raw material is first committed to the process.

A Gemba Walk is the practice of leaders going to the actual place where work happens (the warehouse floor, the dock, the planning office) to observe processes, ask questions, and understand problems firsthand. Gemba is Japanese for the real place.

Hazmat (hazardous materials, also called dangerous goods) refers to substances that pose risks to health, safety, property, or the environment during transport or storage (such as flammables, corrosives, batteries, and compressed gases) and are governed by strict regulations.

A hedge in supply chain planning is a deliberate buffer against a specific uncertainty (extra inventory, forward-bought material, contracted capacity, or a financial instrument) sized and timed to protect against an event rather than routine variability.

The cost of storing one unit of inventory for a defined period, commonly expressed in dollars per unit per year. It is the per-unit form of inventory carrying cost used in lot-sizing formulas.

Horizontal dependency is the relationship among components at the same level of a bill of material: because all of them are required to build one parent unit, a shortage of any single component blocks the assembly of all the others.

Idle capacity is the portion of available production capacity that is not being used (machines, labor, or facilities standing ready but unassigned to work) usually expressed as available hours minus scheduled hours.

Idle time is time during which a worker or machine is available but not producing (waiting for materials, instructions, setups, repairs, or upstream work) representing paid capacity that generates no output.

Incoterms are standardized international trade terms published by the International Chamber of Commerce that define where responsibility, cost, and risk transfer from seller to buyer in a shipment. Common examples include EXW, FOB, CIF, and DDP.

An indented bill of material is a multilevel BOM display that shows the product structure hierarchically, indenting each level so parents, subassemblies, and components appear in their true structural relationships.

ISM is the oldest supply management association in the world, best known for the CPSM certification and the monthly ISM Manufacturing PMI report that financial markets watch closely. It serves procurement and supply management professionals.

Intangible costs are real but hard-to-quantify losses (such as damaged customer goodwill, eroded employee morale, or a weakened brand) that don't appear as line items in accounting but influence supply chain decisions.

Intermodal transportation moves freight using two or more modes, most commonly truck and rail, with the cargo staying in the same container or trailer throughout. Goods are transferred between modes without being unloaded and rehandled.

Internal setup time is the portion of a changeover that can only be done while the machine is stopped (such as removing and mounting dies, making adjustments, and running first-piece inspection) so it directly consumes production capacity.

The Internet of Things (IoT) refers to networks of connected sensors and devices (on trucks, containers, pallets, machines, and shelves) that continuously report location, condition, and status data.

Interoperation time is the elapsed time between the end of one operation and the start of the next on a manufacturing order, made up of queue, wait, move, and staging time rather than actual processing.

The degree to which recorded inventory matches what is physically present, measured by comparing system records to physical counts. It is usually expressed as the percentage of records that match within tolerance.

The total annual cost of holding inventory, including capital, storage, insurance, taxes, shrinkage, and obsolescence, usually expressed as a percentage of average inventory value. Typical rates run 15 to 30 percent per year.

The practice of setting inventory targets analytically so that service goals are met with the least stock investment. It replaces uniform rules of thumb with item-by-item, statistically grounded policies.

The total stock available to meet future demand, calculated as on-hand inventory plus on-order inventory minus backorders and committed allocations. It is the number replenishment decisions should be based on.

A ratio measuring how many times inventory is sold and replaced over a period, typically a year. It is calculated as cost of goods sold divided by average inventory value.

Job shop scheduling is the task of sequencing many different jobs across shared work centers in a job shop, where each job follows its own routing, so that due dates, queue times, and machine utilization stay in balance.

Just-in-Time is a production and replenishment approach in which materials arrive only as they are needed, minimizing inventory throughout the system. It originated in the Toyota Production System.

Kaizen is a Japanese term meaning change for the better, describing a philosophy of small, continuous improvements made by everyone in an organization. It is a foundational concept of Lean thinking and the Toyota Production System.

A key performance indicator is a quantifiable measure used to track how well a supply chain meets its objectives, such as fill rate, forecast accuracy, inventory turnover, or on-time delivery.

A kit is a grouped set of components picked and issued together as one unit (either staged for a production order or sold as a bundled item) so everything needed for assembly or use arrives complete.

A two-by-two portfolio model that classifies purchased items by profit impact and supply risk into strategic, bottleneck, leverage, and non-critical quadrants, each with its own sourcing approach.

The total cost of getting a purchased item to your door, including the unit price plus freight, insurance, duties, taxes, and handling charges.

Last mile delivery is the final leg of a shipment's journey, from a local depot or distribution center to the end customer's door. It is typically the most expensive and operationally complex portion of the delivery chain.

Lead time is the elapsed time between initiating a process, such as placing an order, and its completion, such as receiving the goods. It is one of the most important inputs to inventory, planning, and customer promise decisions.

Lean manufacturing is a management philosophy focused on maximizing customer value while systematically eliminating waste, such as excess inventory, waiting, overproduction, and defects.

Lean Six Sigma Belts are tiered practitioner levels (typically Yellow, Green, Black, and Master Black Belt) that indicate increasing expertise in leading process improvement projects. Each belt reflects greater training, statistical skill, and project leadership responsibility.

Less than truckload shipping combines freight from multiple shippers in one trailer, with each paying only for the space and weight they use. It suits shipments of roughly one to ten pallets that are too big for parcel but too small for a full truck.

A level schedule (production leveling or heijunka) is a production plan that distributes volume and product mix evenly across time periods, so the line builds a stable, repeating pattern instead of large batches that follow demand spikes.

Life cycle costing is the evaluation of an asset or product's total cost across its entire life (acquisition, operation, maintenance, and disposal) rather than purchase price alone, enabling comparisons on whole-life economics.

A lifetime buy (last-time buy or end-of-life buy) is a single final purchase of a component that is being discontinued, sized to cover all expected demand (production, service, and warranty) for the remaining life of the products that use it.

Last In, First Out: an inventory accounting method where the most recently acquired stock is expensed first. Under inflation it raises cost of goods sold and lowers reported profit and taxes.

Little's Law is the queuing relationship stating that average inventory in a system equals average throughput multiplied by average flow time (WIP = throughput × lead time), linking the three core measures of any process.

A Logistics Coordinator plans and tracks the movement of goods, booking carriers, preparing shipping documents, and resolving delivery exceptions. It is a common entry point into transportation and distribution careers.

A low-level code is a number assigned to each item identifying the lowest level at which it appears in any bill of material, used by MRP to ensure an item's requirements are fully accumulated before its needs are calculated.

Machine learning forecasting predicts demand using algorithms that learn patterns from many variables at once (history, price, promotions, weather, holidays) rather than fitting a single statistical curve to past sales.

The strategic choice between producing a good or service in-house and purchasing it from an external supplier.

A manufacturing order (production order or work order) is the authorization to produce a specific quantity of an item by a due date, carrying the bill of material and routing that define the components and operations required.

Master Data Management (MDM) is the discipline and tooling for keeping core reference data (items, suppliers, customers, locations, units of measure) accurate, complete, and consistent across every system that uses it.

The Master Production Schedule (MPS) is the anticipated build plan for finished products or key end items, stating what will be produced, in what quantity, and in which time period. It is the primary input that drives MRP.

Material Requirements Planning (MRP) is a calculation engine that translates a production schedule into time-phased requirements for every component and raw material, using bills of materials, inventory records, and lead times.

Purchases made outside approved procurement channels or negotiated contracts, typically without a purchase order or authorized supplier.

A milk run is a scheduled route in which one vehicle makes multiple pickups or deliveries in a fixed sequence, such as collecting parts from several suppliers on a loop and delivering them to one plant. The name comes from historical dairy delivery rounds.

A simple replenishment method where an order is triggered when inventory falls to a minimum level and stock is replenished up to a maximum level. The min acts as the reorder point and the max caps the order-up-to quantity.

The smallest quantity of an item a supplier is willing to sell in a single order, driven by their setup costs, batch sizes, or packaging units.

A modular bill of material organizes a configurable product into option modules (such as engines, cabs, and transmissions) so any customer configuration can be built by combining modules instead of maintaining a BOM for every possible variant.

An advanced approach that optimizes inventory targets across all tiers of a network simultaneously, such as plants, central DCs, and regional warehouses, rather than setting buffers at each location independently.

Spreading purchases of an item or category across three or more suppliers to maximize supply security and continuous competitive tension.

A multilevel bill of material is the complete product structure showing every level of assembly (from the finished item through subassemblies down to purchased components and raw materials) with quantities linking each parent to its children.

Nearshoring is relocating sourcing or production from distant countries to ones closer to the end market, while reshoring brings it back to the home country. Both aim to shorten lead times and reduce supply chain risk.

Ocean freight is the transport of goods by sea, typically in standardized containers aboard container ships. It is the dominant mode for international trade, offering the lowest cost per unit at the price of long transit times.

The physical quantity of stock currently present in a location, regardless of whether it is committed to orders. It is what you would find if you walked out and counted the shelves.

Stock that has been ordered from suppliers or other facilities but not yet received, represented by open purchase orders, transfer orders, or production orders. It is committed inbound supply.

OTIF measures the percentage of orders delivered both on the promised date and with the complete ordered quantity. An order must pass both tests to count, making OTIF a strict combined measure of delivery service.

Operations management is the discipline of designing, running, and improving the processes that transform inputs into goods and services, covering capacity, scheduling, inventory, quality, and workforce decisions in factories, warehouses, and service operations.

Opportunity cost is the value of the best alternative given up when a resource is committed to one use, such as the return capital tied up in inventory could have earned if invested elsewhere.

Option overplanning is the practice of deliberately planning option modules to a higher percentage than the expected mix (for example planning 45% for an option forecast at 40%) so mix variability doesn't cause shortages in assemble-to-order production.

Order fulfillment is the end-to-end process of receiving a customer order and delivering it: order capture, allocation, picking, packing, shipping, and confirmation. It is where supply chain performance becomes visible to the customer.

An Order Management System (OMS) is software that captures orders from every sales channel and orchestrates how each one is sourced, allocated, fulfilled, and returned across the network.

The fixed cost incurred each time an order is placed, independent of order size, covering activities like purchase order processing, receiving, inspection, and invoice handling. In manufacturing, the equivalent is setup cost.

An outlier is a data point that falls far outside the normal pattern of a series (such as a demand spike from a one-time bulk order) and can distort forecasts, safety stocks, and performance metrics if left untreated.

Outsourcing is contracting an external provider to perform activities previously done in-house, such as manufacturing, warehousing, transportation, or planning. It trades direct control for cost, flexibility, and access to specialized capability.

Overhead allocation is the process of assigning indirect costs (such as rent, utilities, supervision, and equipment depreciation) to products, orders, or services using an allocation base like labor hours, machine hours, or activity drivers.

The pacemaker is the single production process in a value stream that is scheduled directly and sets the pace for everything else, upstream processes replenish to its pull, and downstream steps flow from it in sequence.

Pareto's law, also called the 80/20 rule, is the principle that a small share of causes drives most of the effect, in supply chains, typically about 20% of SKUs, customers, or suppliers account for roughly 80% of value or volume.

The contractually agreed timing and conditions for paying supplier invoices, such as net 30 or net 60 days, often including any discounts for early payment.

A perfect order is one delivered complete, on time, damage-free, and with accurate documentation. The perfect order rate multiplies these components together, making it one of the most demanding measures of fulfillment quality.

A performance standard is an established benchmark (such as units per hour, picks per shift, or defects per million) against which actual work output, quality, or process results are measured and managed.

Periodic replenishment is an inventory control method that reviews stock at fixed intervals (such as weekly) and orders enough each time to restore inventory to a target level, instead of reordering whenever stock hits a reorder point.

An inventory policy where stock levels are checked at fixed intervals and an order is placed to raise inventory to a target level. Order timing is fixed while order quantity varies.

A phantom bill of material defines a subassembly that exists in the product structure but is never stocked. It is built and immediately consumed in the parent, so MRP plans through it directly to its components.

Pick and pack is the warehouse fulfillment process of retrieving individual items for an order from storage locations and packing them into cartons for shipment. It is the core labor activity in most order fulfillment operations.

Pick-to-light is an order picking technology that uses light displays mounted at storage locations to show workers exactly where to pick and how many units to take, confirmed at the press of a button.

A picking list (pick list) is a document or digital task list that tells a warehouse operator exactly which items, quantities, and locations to pick to fulfill one or more orders, sequenced to minimize travel.

Inventory that has been ordered or shipped but has not yet arrived at its destination, such as goods in transit between a supplier and a warehouse. It is owned but not yet available to sell.

A planning bill of material is an artificial BOM that groups items for forecasting rather than building, typically a product family parent whose components are options and common parts weighted by their expected percentage of total demand.

Poka-yoke is a mistake-proofing device or design feature that makes an error either impossible to commit or immediately obvious, such as a fixture that only accepts a part in the correct orientation.

Postponement is the strategy of delaying final product differentiation, such as configuration, packaging, or labeling, until customer demand is known. It lets companies hold flexible, generic inventory instead of guessing the mix of finished variants.

Predictive analytics uses historical and real-time data to estimate what will happen next (late shipments, demand spikes, supplier failures, machine breakdowns) so teams can act before the event occurs.

Prescriptive analytics goes beyond predicting outcomes to recommending or automating the best action, typically using optimization or simulation to weigh costs, constraints, and service goals.

A quantity threshold at which a supplier's unit price drops, so ordering more units per order earns a lower price per unit.

Priority planning is the function of determining what to make and when (setting and maintaining valid due dates and quantities for orders) as distinct from capacity planning, which determines whether the resources exist to do it.

The end-to-end business function of acquiring goods and services an organization needs, covering everything from identifying requirements and selecting suppliers to contracting, ordering, and paying invoices.

A Procurement Specialist, or Buyer, sources and purchases the goods and services a company needs, negotiating price, terms, and delivery with suppliers. The role spans transactional purchasing through strategic sourcing depending on seniority.

A product family is a group of products that share common characteristics (similar materials, processes, or market purpose) and are planned together as one unit in forecasting, S&OP, and capacity planning.

A product road map is a time-phased plan showing when products will be introduced, enhanced, and retired, giving supply chain teams the forward visibility needed to plan capacity, sourcing, and inventory around lifecycle transitions.

Productive capacity is the portion of a resource's capacity actually used to produce saleable output, the hours generating throughput, as distinguished from idle capacity and protective capacity held in reserve.

The PMP is the Project Management Institute's globally recognized certification for project managers, covering predictive, agile, and hybrid delivery approaches. Supply chain professionals pursue it to lead initiatives like network redesigns, system implementations, and supplier transitions.

Proof of delivery (POD) is the documentation confirming a shipment was received at destination, traditionally a signed delivery receipt and increasingly an electronic signature, photo, or GPS-stamped scan. It establishes when, where, and in what condition goods were delivered.

Protective capacity is extra capacity deliberately maintained at non-bottleneck resources so they can catch up after disruptions and keep the constraint continuously supplied, protecting system throughput from normal variability.

A legally binding commercial document a buyer issues to a supplier specifying the items, quantities, prices, delivery dates, and terms of a purchase.

The difference between the standard or budgeted price of a purchased item and the price actually paid, multiplied by the quantity bought.

An internal request asking the procurement team to buy specific goods or services, which must typically be approved before it is converted into a purchase order.

A push strategy produces and positions inventory based on forecasts before demand occurs, while a pull strategy triggers production or replenishment only in response to actual demand. Most real supply chains combine both around a push-pull boundary.

Putaway is the warehouse process of moving received goods from the dock to their assigned storage locations and confirming the placement in the inventory system. It closes the receiving process and makes stock available for picking.

Pyramid forecasting is a technique that reconciles forecasts made at different levels of aggregation (item, product family, and total business) so that detailed and summary plans always roll up and force down to consistent numbers.

Radio Frequency Identification (RFID) uses small tags that transmit their identity via radio waves, allowing items, cases, or pallets to be identified and counted without line-of-sight scanning.

A real-time transportation visibility platform (RTTVP) aggregates live location and status data from carriers, telematics, and ports across all modes to show where every shipment is and predict when it will actually arrive.

The inventory level that triggers a replenishment order. It equals expected demand during supplier lead time plus safety stock.

The number of units ordered when a replenishment is triggered. It may be a fixed lot size such as the EOQ, or a variable amount calculated to reach a target stock level.

The process of restocking inventory to meet ongoing demand, whether by purchasing from suppliers, transferring between locations, or triggering production. It is the execution engine that keeps stock policies real.

A preliminary questionnaire sent to potential suppliers to gather facts about their capabilities, capacity, and offerings before running a formal RFQ or RFP.

A formal document asking suppliers to propose how they would meet a business need, evaluated on solution quality, capability, and total value as well as price.

A formal invitation asking suppliers to submit prices for clearly specified goods or services, used when requirements are well defined and price is the main decision factor.

Reverse logistics is the process of moving goods backward through the supply chain, from the customer toward the seller or manufacturer, for returns, repairs, recycling, or disposal. It covers everything from return shipping to disposition decisions.

Robotic Process Automation (RPA) uses software 'bots' that mimic human keyboard-and-mouse work (copying data between systems, filling forms, checking portals) to automate repetitive digital tasks.

Route optimization is the process of determining the most efficient sequence of stops and paths for delivery vehicles, minimizing distance, time, or cost while respecting constraints like time windows, vehicle capacity, and driver hours.

Extra inventory held beyond expected demand to protect against variability in demand or supply. It acts as a buffer that keeps orders flowing when forecasts miss or deliveries run late.

Sales and Operations Planning (S&OP) is a monthly cross-functional process that aligns demand, supply, inventory, and financial plans into one company-wide plan. It gives leadership a single set of numbers to run the business on over a 3-to-24-month horizon.

An S&OP Manager runs the monthly cross-functional process that aligns sales forecasts, supply plans, inventory targets, and financial goals into one agreed operating plan. The role orchestrates decisions across sales, operations, finance, and supply chain.

Sales mix is the proportion of total sales contributed by each product or product line, which determines overall profitability when items carry different margins, and shapes capacity, inventory, and break-even calculations.

The SCOR model (Supply Chain Operations Reference) is a standard framework that describes supply chain processes, metrics, and best practices, organized around Plan, Source, Make, Deliver, Return, and Enable.

SCPro is CSCMP's three-tier supply chain certification that progresses from foundational knowledge to analyzing case studies to leading a real-world improvement project. It emphasizes applied problem-solving over memorization.

The target probability of not stocking out during a replenishment cycle, or more broadly the standard of product availability promised to customers. It is the key input for sizing safety stock.

Shingo's seven wastes are the categories of non-value-adding activity identified in the Toyota Production System (overproduction, waiting, transportation, overprocessing, inventory, motion, and defects) that lean improvement works to eliminate.

The shipper is the party that tenders goods to a carrier for transport, typically the seller or origin facility named on the bill of lading. In freight contracts, the shipper is the carrier's customer.

An estimate of what a product or service ought to cost, built bottom-up from materials, labor, overhead, and margin, used to evaluate supplier prices objectively.

The loss of inventory between receipt and sale from causes such as theft, damage, spoilage, administrative error, or vendor fraud. It appears as the gap between recorded and actual stock.

Simulation modeling builds a computer model of a supply chain process or network and runs it many times with realistic variability to test how designs and policies perform before committing real money.

A deliberate strategy of buying an item from one supplier even though qualified alternatives exist, usually to maximize volume leverage and simplify management.

A single-level bill of material lists only an item's immediate components (one level down) with quantities per parent, serving as the building block from which multilevel product structures are assembled.

Six Sigma is a data-driven methodology for reducing defects and variation in processes, using statistical tools and the DMAIC improvement cycle. In supply chain, it is applied to problems like forecast error, order accuracy, and lead time variability.

Stock Keeping Unit: a unique identifier for a distinct item that is stocked, tracked, and sold, defined by attributes such as size, color, and pack configuration. Each variation that must be counted separately gets its own SKU.

The systematic review of the product portfolio to prune SKUs that add complexity without sufficient sales, margin, or strategic value. It reduces the long tail that consumes inventory, space, and planning effort.

Slack is the amount of time an order or activity can be delayed without missing its due date, calculated as time remaining until the due date minus the remaining work and setup time.

Stock that sells or is consumed at a much lower rate than expected, sitting in the warehouse far longer than average. It still has demand, unlike dead stock, but turns too slowly to justify its inventory level.

Software as a Service (SaaS) is a delivery model where applications are hosted by the vendor in the cloud and accessed through a browser on subscription, with upgrades and maintenance handled by the provider.

A situation where only one supplier is capable of providing an item or service, leaving the buyer with no practical alternative source.

The process of collecting, cleansing, and classifying purchasing data to reveal what an organization buys, from whom, at what price, and where savings or risks hide.

Standard time is the time a qualified worker needs to complete a task at a normal, sustainable pace using the prescribed method, including allowances for fatigue, personal needs, and unavoidable delays.

A stockout occurs when inventory of an item is exhausted and demand cannot be met from available stock. It results in lost sales, backorders, expediting costs, and eroded customer trust.

The cost incurred when demand cannot be met from available inventory, including lost sales, expediting, penalties, and damaged customer relationships. It is the counterweight to holding cost in service level decisions.

A structured, data-driven approach to selecting suppliers that optimizes total value over time rather than just chasing the lowest unit price on each transaction.

A super bill of material is a planning BOM whose parent is an artificial family item and whose components are the option modules and common-parts groups that make up the family, each carried at its forecast percentage of total demand.

A structured on-site or remote assessment of a supplier's processes, quality systems, capacity, and compliance against defined standards.

A deliberate program of working with a supplier to improve their capabilities, quality, cost, or delivery performance so they better meet the buyer's needs.

A procurement practice of intentionally including businesses owned by underrepresented groups, such as minority-, women-, or veteran-owned firms, in sourcing opportunities.

The elapsed time from placing an order with a supplier until the goods are received and available for use, including production, transit, and receiving.

The structured process of reaching agreement with suppliers on price, terms, and conditions, using preparation, market data, and leverage to secure the best total-value outcome.

The formal process of verifying that a prospective supplier can reliably meet quality, capacity, financial, and compliance requirements before awarding them business.

The systematic practice of segmenting suppliers, managing performance, and collaborating with strategic ones to extract more value than transactional buying alone can deliver.

A periodic report that grades a supplier's performance against agreed metrics such as on-time delivery, quality, cost, and responsiveness.

A Supply Chain Analyst gathers and analyzes data across planning, procurement, inventory, and logistics to identify cost savings and performance improvements. It is one of the most common entry points into a supply chain career.

A supply chain control tower is a centralized dashboard and decision hub that pulls data from many systems to give end-to-end visibility of orders, inventory, and shipments, with alerts and workflows for exceptions.

Supply chain management (SCM) is the coordination of all activities involved in sourcing, making, and delivering a product, from raw materials to the end customer. It aims to meet customer demand at the lowest total cost across the entire network.

Supply chain network design is the strategic process of deciding the number, location, size, and role of facilities such as plants, warehouses, and cross-docks, and how product flows between them. It sets the structural cost and service capabilities of the chain.

Supply chain planning software is a suite of applications covering demand planning, inventory optimization, supply and production planning, and S&OP, used to decide what to make, buy, stock, and move, and when.

Supply chain resilience is the capacity to anticipate, absorb, and recover quickly from disruptions such as supplier failures, natural disasters, or demand shocks, while continuing to serve customers.

Supply chain risk management is the systematic identification, assessment, and mitigation of events that could disrupt supply, demand, or operations, ranging from supplier bankruptcies to cyberattacks and geopolitical shocks.

Supply chain visibility is the ability to track materials, orders, shipments, and inventory across the end-to-end chain in near real time, including tiers and partners you do not directly control.

A Supply Planner translates demand forecasts into supply plans, deciding what to make or buy, when, and in what quantities. They balance service levels against inventory investment and capacity constraints.

Supply planning determines how a company will meet the demand plan: what to make or buy, in what quantities, where, and when. It translates forecasted demand into production schedules, purchase plans, and inventory targets.

Surge capacity is the ability to rapidly scale output above normal levels for a short period (through overtime, extra shifts, temporary labor, or outsourcing) to absorb demand peaks or recover from disruptions.

A sustainable supply chain manages environmental and social impacts across sourcing, production, and logistics, covering emissions, waste, water, labor practices, and ethical sourcing alongside cost and service.

The large number of low-value, infrequent purchases that collectively make up a small share of total spend but a large share of suppliers and transactions.

Telematics combines GPS, onboard sensors, and cellular communication in vehicles to transmit location, speed, engine data, driver behavior, and trailer conditions back to fleet management systems.

A TEU is the standard unit of container capacity, equal to one twenty-foot shipping container. A forty-foot container (FEU) counts as two TEU, and the measure is used to size vessels, ports, and trade volumes.

A third-party logistics provider is an outside company that handles logistics functions such as warehousing, transportation, and order fulfillment on behalf of a shipper. Businesses use 3PLs to access logistics capacity and expertise without owning the assets themselves.

Throughput is the rate at which a system produces sellable output, such as units per hour or orders shipped per day. In theory-of-constraints usage, it means the rate at which the business generates money through sales.

A time bucket is the unit of time (typically a day, week, or month) into which a planning system groups demand, supply, and schedule data, defining the granularity of an MRP or forecasting plan.

The complete cost of acquiring an item from a supplier, including price, logistics, transaction costs, quality costs, and inventory costs, not just the quoted unit price.

Total cost of ownership (TCO) is the complete cost of acquiring and using a product or supplier over its life, including price plus freight, duties, inventory, quality, risk, and end-of-life costs, not just the purchase price.

Track and trace is the capability to follow products forward through the supply chain (tracking) and reconstruct their history backward (tracing) at the shipment, batch, or serial-number level.

Transit time is the elapsed time between a shipment leaving its origin and arriving at its destination. It is a core component of total lead time and a key input to inventory and delivery planning.

A Transportation Management System (TMS) is software for planning, executing, and auditing freight movements, selecting carriers and modes, building loads, tendering shipments, tracking them, and paying the bills.

U-lines are production cells arranged in a U shape so the entrance and exit sit side by side, letting one or more multi-skilled operators tend several stations with minimal walking and allowing staffing to flex with demand.

The value chain is the full set of activities a company performs to create and deliver value to customers, from inbound logistics and operations through marketing, delivery, and after-sales service. The concept was introduced by Michael Porter.

A replenishment arrangement in which the supplier monitors the customer's inventory and demand data and decides when and how much to replenish. The vendor takes responsibility for keeping agreed stock levels in place.

Vertical dependency is the parent-child relationship between levels of a bill of material: demand for a parent item directly creates demand for the components beneath it, cascading down through every BOM level.

Vertical integration is the strategy of owning multiple sequential stages of the supply chain, such as a manufacturer acquiring its raw material supplier (backward integration) or its distribution channel (forward integration).

Voice picking is a hands-free, eyes-free warehouse method where workers wear a headset that speaks pick instructions and listens for spoken confirmations, communicating with the WMS in real time.

Warehouse automation is the use of mechanized and robotic systems (conveyors, sorters, AS/RS, mobile robots, automated packing) to move, store, pick, and sort goods with less manual labor.

A Warehouse Management System (WMS) is software that directs and records all activity inside a warehouse (receiving, putaway, picking, packing, and shipping) down to the individual location and unit.

A where-used list is a report showing every parent assembly and product in which a given component appears, tracing the bill of material upward, the reverse of a BOM explosion.

Working capital is the cash a business has tied up in day-to-day operations, calculated as current assets minus current liabilities. In supply chain terms, it is dominated by inventory, receivables, and payables.

Yard management is the control of trailers, containers, and trucks within a facility's yard, covering gate check-in, parking assignments, trailer moves to and from doors, and inventory of what is sitting where. It bridges transportation and the warehouse.