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- Safety StockInventory kept as a buffer against variability in demand and replenishment lead time. It is distinct from cycle stock and is used when actual conditions differ from the plan. The quantity is set from a target service level, forecast error, lead time, and variability of demand during lead time, and it is added to expected demand in the reorder point.
- Scac Standard Carrier Alpha CodeA distinct two to four letter identifier for motor carriers, railroads, and ocean carriers in North America, assigned by the National Motor Freight Traffic Association. It appears on bills of lading, freight invoices, EDI messages, and US customs filings to identify the carrier in a standard format.
- Seasonal InventoryStock acquired or produced in advance to meet predictable demand peaks tied to specific calendar periods, holidays, or events. It is planned above normal cycle stock using forecasted demand, lead times, and capacity limits, then drawn down after the period ends. Tracked separately from safety stock, it typically includes a prebuild schedule, storage allocation, and a disposition plan such as markdown or return to vendor.
- Section 321A provision of United States customs law that allows goods valued at eight hundred dollars or less to enter without duties and taxes when imported by one person on one day. Qualifying shipments can be released without a formal entry, while required electronic data must still be filed by a carrier or broker. Items subject to antidumping or countervailing duties, certain regulated products, and goods needing approvals from partner government agencies do not qualify. The rule is widely used for cross border e commerce parcels shipped direct to consumers.
- Serialized InventoryInventory tracked at the individual item level using a unique serial number for each unit. The identifier is recorded at receiving and carried through storage, picking, packing, shipping, returns, and service so each unit has a traceable history. Often applied to electronics, medical devices, and regulated goods. Supports authentication, warranty validation, recall execution, anti theft controls, and compliance reporting. Differs from lot controlled inventory, which tracks groups of items rather than single units.
- Service Level Agreement SlaA contract between a service provider and a customer that defines the scope of services, performance targets, and the methods for measuring and reporting results. In logistics it often lists metrics such as on time delivery rate, order accuracy, inventory accuracy, response time, and cut off times, along with calculation formulas, data sources, roles, escalation steps, service credits or other remedies, exclusions, and a review cadence.
- Shadow FreightTransportation costs that exist but are not recorded as a separate freight line. They are embedded in product pricing or other accounts, such as vendor prepaid shipping rolled into unit cost, free shipping included in purchase price, or internal transfer freight booked to cost of goods sold. Because the charge is not itemized as freight, it is often missed in landed cost and freight spend analysis.
- Ship From StoreAn omnichannel fulfillment method in which online orders are picked, packed, labeled, and handed off to a carrier from a retail store rather than a distribution center. Store inventory and staff process the order using point of sale or order management data for allocation and tracking. The store operates as a local shipping node with typical artifacts such as labels and a manifest.
- Shipment ConsolidationThe practice of combining multiple shipments traveling to the same destination or corridor into one larger load. Orders are collected at a warehouse or consolidation center, built into shared pallets, containers, or trailers, and tendered under a single master bill of lading or air waybill. The load is separated at a hub or destination facility for final delivery, using capacity more fully and sometimes qualifying for volume rate tiers.
- Shipping Accuracy RateThe percentage of shipments sent without errors based on defined criteria. Criteria often include correct items, quantities, packaging, documentation, address, and service level. Calculated as error free shipments divided by total shipments for a given period, then multiplied by 100.
- Shipping AggregatorA platform that centralizes access to multiple parcel and freight carriers in one interface. It returns rates and service options, generates labels, submits electronic shipment data, and unifies tracking and billing across carriers. An aggregator does not transport goods and is distinct from a carrier or a freight broker.
- Shipping CarrierA transportation company that physically moves parcels or freight under its own operating authority and service terms. It handles pickup, linehaul, and final delivery, issues labels and tracking numbers, and publishes rates, transit times, and liability rules. Examples include parcel networks, regional couriers, less than truckload and truckload carriers, air cargo lines, and ocean lines. Distinct from a broker that only arranges transport.
- Shipping Cutoff TimesThe latest time a warehouse, store, or website accepts an order for same day handoff to a carrier or for a specific service level. Cutoffs are set per facility, carrier, destination, and time zone to match pick and pack schedules and pickup departures. Orders received after the cutoff are scheduled for the next processing window, which can shift delivery dates.
- Shipping ManifestA detailed list of all packages or containers tendered in a single shipment or pickup, showing shipper and consignee information, counts, identifiers such as tracking numbers, descriptions, weights, and dimensions. It is provided to the carrier in paper or electronic form and used to verify handoff, support billing and auditing, and supply data for customs on international moves.
- Shipping ZonesCarrier defined geographic groupings that organize delivery destinations into distance bands measured from the ship from origin. Parcel carriers use these zones to calculate shipping rates, apply surcharges, and set transit time standards. Zones are relative to each origin and may vary by carrier, service level, and package type.
- Short ShippingThe delivery of fewer units than stated on the purchase order or shipping documents, creating a quantity discrepancy between the order and the physical shipment. The receiver records the variance as a shortage on the packing list, bill of lading, or receiving report. Resolution may involve a backorder, a replacement shipment, a credit or debit memo, or a carrier or vendor claim.
- SKU ManagementStructured control of stock keeping units across their lifecycle and systems. It covers standardized item setup and maintenance including naming, attributes, dimensions, weight, barcodes, and pack configurations. It defines governance for new item creation, changes, and retirement and aligns locations, reorder points, safety stock, and lot or serial tracking in WMS, ERP, and OMS. It includes data quality tasks such as de duplication and cross references to vendor or customer part numbers and kit or bundle relationships. Common measures include stockout rate, fill rate, inventory turnover, and obsolete inventory.
- SKU OptimizationStructured process for selecting the target mix of stock keeping units and setting item level inventory parameters. It evaluates sales history, demand variability, margin, carrying cost, and operational constraints to decide which items to add, retain, modify, or discontinue and to define stocking levels, reorder points, and case or inner pack sizes. The process links with slotting, forecasting, and replenishment rules to match storage locations and handling methods to item characteristics. Typical measures include inventory turnover, gross margin return on inventory, service level by SKU, and obsolete inventory rate.
- SKU ProliferationIncrease in the number of distinct stock keeping units in a product catalog. It commonly results from line extensions such as new sizes, colors, formulations, bundles, private label variants, or customer specific configurations. Rising counts affect forecasting, purchasing, storage allocation, slotting, and picking, and can shift demand toward a long tail of low volume items. Typical metrics include total SKU count, new to discontinued ratio, average demand per SKU, and item master accuracy.
- SKU RationalizationStructured review of a product catalog to decide which SKUs to keep, modify, consolidate, or discontinue using measurable performance and handling criteria. Inputs commonly include unit sales, order frequency, gross margin, demand variability, carrying cost, storage footprint, pick and pack effort, lead time, supplier minimums, and substitution options. Outputs are an approved assortment, phase out plans, and merged items, with corresponding updates to item master data, forecasts, safety stock, reorder points, and warehouse slotting.
- SKU (Stock Keeping Unit) A SKU is a unique alphanumeric code assigned to a product or product variation for inventory tracking and management purposes. Businesses use SKUs to identify specific items based on attributes such as size, color, style, or packaging, enabling accurate inventory control, order fulfillment, reporting, and replenishment. Unlike universal product identifiers such as UPCs, SKUs are created internally and customized to meet a company's operational needs.
- Slotting OptimizationData driven assignment of SKUs to warehouse locations based on how items are stored, picked, and replenished. It analyzes demand velocity, order profiles, dimensions, weight, packaging, and handling method to select the storage medium and forward pick slot for each item. Common rules include velocity based zoning, family or affinity placement, ergonomic limits, and rotation methods such as FIFO or FEFO, with constraints for temperature, hazardous segregation, and lot or serial control. Outputs include location recommendations, pick face capacities, and replenishment levels that are executed in a warehouse management system and reviewed on a defined cycle.
- Small Parcel FreightPackage shipments moved through parcel carrier networks as individual pieces rather than on pallets. In the United States this category typically covers parcels up to about 150 pounds within specific limits for length and length plus girth, with thresholds set by each carrier. Parcels enter the network with an address label and barcode, are consolidated and sorted through regional hubs by service level and zone, and are released to local units for final delivery. Charges are based on billed weight, which is the greater of actual weight and dimensional weight calculated from package measurements, along with the selected service level. Common extra fees include fuel, residential delivery, additional handling, declared value, address correction, and Saturday service. Tracking data usually records pickup, acceptance, in transit, out for delivery, and delivered events that feed customer and billing systems.
- Smart Locker DeliveryA last mile parcel method where carriers deposit packages into secure, networked lockers for recipient pickup. Each delivery is assigned to a compartment, and the system records locker identifier, time stamp, and carrier credentials to preserve chain of custody. The recipient receives a notice with a pickup code, QR code, or mobile app credential and retrieves the parcel within a defined window. Lockers are placed at residential buildings, transit hubs, and retail sites and may offer compartments in multiple sizes or temperature ranges. Platforms can also handle returns by issuing a code to open an empty compartment for drop off and generating a receipt. Merchant and carrier systems can integrate with the locker platform to exchange tracking events and status updates.
- Smart WarehousingA warehouse operating model that uses software, connected devices, and automation to manage storage and handling activities. Core components include a warehouse management system integrated with sensors, barcode or RFID capture, and equipment such as conveyors, pick to light, voice systems, automated guided vehicles, and autonomous mobile robots. Data from these systems supports real time location tracking, rule based task allocation, digital work instructions, and exception alerts. It can interface with transportation and enterprise systems to share order, inventory, and shipment status, and may apply analytics or machine learning to slotting, labor planning, and replenishment. The result is consistent execution, traceable records, and faster problem detection compared with manual only operations.
- Specialty FulfillmentThe processing of orders that require nonstandard handling, configuration, or documentation beyond routine pick, pack, and ship. It covers product specific workflows such as kitting and light assembly, personalization or relabeling to a specification, and programs that mandate routing guide compliance or retailer specific labeling. For regulated or sensitive items it can include lot control, serial number capture, temperature management, chain of custody records, and hazmat packaging in line with applicable rules. Work is performed in defined procedures with dedicated work areas, calibrated tools, quality checks, and complete audit trails so packaging, labeling, storage, and data capture match the requirements of the item or customer program.
- Split ShipmentThe fulfillment of a single customer order or purchase order in two or more separate outbound shipments. Items are packed and dispatched at different times or from different facilities when inventory locations differ, items are on backorder, or packaging and carrier limits require separate consignments. Each shipment receives its own label, tracking number, and planned delivery date, and may generate separate freight bills and accessorial charges. Documentation records the split with multiple cartons or bills of lading tied to the same order reference so quantities and charges can be reconciled.
- Spot QuoteA one time price offered by a carrier, broker, or forwarder for a specific shipment outside any standing contract or tariff. Pricing reflects the shipment details and current capacity for the lane, including origin and destination, pickup and delivery dates, distance, weight, dimensions, freight class, equipment or container type, service level, fuel, and expected accessorial charges. The quote applies only to the named load under the stated terms and is typically valid for a short period or until capacity is booked. Spot quotes are used when no contracted rate exists for the lane or when a shipment falls outside contract parameters, and acceptance creates a booked move subject to the provider’s rules and required documentation.
- Standard Operating Procedures (SOPs)Written instructions that define how warehouse tasks are carried out from start to finish. They specify roles, required inputs, tools, and system actions for activities such as receiving, putaway, replenishment, picking, packing, shipping, cycle counting, returns, and yard movements. Each SOP states the sequence of steps, scan points and data fields, acceptance tolerances, safety and quality checks, exception handling with decision rules, and required records such as timestamps and signatures. Documents include version control, ownership, and training requirements and are reviewed on a set cadence or after process changes. SOPs support audits and alignment with regulatory or customer standards and provide the basis for measuring performance through metrics such as order accuracy, pick rate, dwell time, and inventory record accuracy.
- Stock Keeping Unit (SKU)An internal identifier assigned by a retailer, manufacturer, or warehouse to represent a specific product and stocking configuration. It corresponds to a defined set of attributes such as brand, model, variant, size, and packaging, and may be different for each, inner pack, case, or pallet according to item master rules. An SKU is not a universal barcode like a UPC or EAN and can link to one or more barcodes for scanning. Systems use the SKU as the core reference for receiving, inventory counting, replenishment parameters, pick locations, lot or serial tracking, and cost records. Typical fields stored for an SKU include description, unit of measure, dimensions, weight, hazardous or handling notes, reorder point, safety stock, and substitution or discontinuation status.
- StockoutA condition where a specific item at a given location has no available inventory to satisfy current demand or planned allocation. The event is identified when available to promise or on hand quantity is zero after accounting for holds, reservations, and non saleable stock such as damaged or quarantined units. Systems may create a backorder, split the order, apply an approved substitution, or cancel the line based on defined rules. Records capture time, SKU, location, and a cause code, and performance is tracked with measures such as stockout frequency, duration, units or orders affected, line fill rate, and service level. It is distinct from a backorder, which is the open order record awaiting future supply.
- Store FulfillmentUse of retail stores to pick, pack, and hand off orders placed online or routed from other locations. Order types include ship from store, buy online pickup in store, curbside pickup, and store to store transfer. Typical steps are order release to the store system, item location and scanning by staff, staging in a backroom, packing with receipts or shipping labels, and either customer handoff or carrier pickup with a manifest. Systems coordinate inventory updates between point of sale and order management, set location assignments and cutoffs, and record metrics such as fill rate, pick time, and order cycle time, with procedures for substitutions, partial fills, and returns.
- Subscription Box FulfillmentThe warehouse process for assembling and shipping recurring kits to subscribers on a defined cycle. Work includes forecasting component demand, receiving and lot tracking of parts, and either pre kitting or pick to cart followed by line assembly with quantity and variant checks. Packing adds cartons, protective materials, printed inserts, and any required age or hazardous materials marks, then weight capture and label generation for the selected carrier service. Systems manage order cutoffs, address validation, gift or skip rules, and bill of materials version control so the correct contents ship in each wave. Quality checks record counts and any serial or lot data, and reports track yield, scrap, unit cost, and on time ship to the cycle date.
- Supply Chain Management (SCM)The coordinated planning and control of how goods, information, and funds move from suppliers to customers. Scope includes demand planning and forecasting, procurement and supplier management, production scheduling, inventory control across plants and warehouses, order fulfillment, transportation, and returns. Programs define data standards and integrations among ERP, warehouse and transportation systems, and supplier or customer portals. Governance sets service targets, cost and working capital objectives, compliance requirements, risk monitoring, and roles across functions. Performance is tracked with measures such as service level, order cycle time, forecast accuracy, inventory turns, and total landed cost.
- Supply Chain OptimizationThe application of data and mathematical models to design and run sourcing, production, inventory, and distribution within stated constraints and targets. Methods include network modeling, multi echelon inventory planning, demand forecasting, production and transportation planning, and routing. Inputs cover demand distributions, lead times, costs, capacities, and allowable service targets, with variability captured through scenarios or simulation. Techniques include linear and mixed integer programming, heuristics, simulation, and machine learning where appropriate. Results produce recommended facility locations and flows, reorder and safety stock settings, mode and carrier assignments, batch sizes, and schedules, which are reviewed against total landed cost, service level, cycle time, and asset utilization metrics, with change control and periodic reoptimization documented.
- Supply Chain ResiliencyThe ability of a supply chain to meet defined service and cost targets when conditions change and to restore planned performance after disruption. It is built through structural choices such as diversified suppliers, alternative routes and nodes, inventory buffers set by reorder and safety stock policies, and contractual options for surge capacity. Operational capabilities include scenario planning, risk monitoring, event playbooks, expedited reallocation of orders and inventory, and visibility across production, warehouses, and transport. Measurement uses time to recover, time to survive, service level during an event, and lead time variability. Governance documents roles, decision rights, and communication triggers for incidents and post event review.
- Supply Chain VisibilityThe ability to view current and historical status of orders, inventory, and shipments across suppliers, carriers, warehouses, and sales channels. Data is captured from barcodes, RFID, telematics devices, and system integrations such as EDI and APIs, then standardized into events with identifiers, timestamps, locations, and quantities. Systems present this information on timelines and maps, calculate estimated arrival times, and flag exceptions when planned milestones are missed or quantities do not reconcile. Scope covers purchase orders, production, in transit moves, customs releases, delivery with proof of delivery, and returns. Programs define data standards, identifier keys such as order number or Serial Shipping Container Code, retention periods, and user permissions so records can be audited and shared. Performance is measured with metrics such as event completeness, data latency, match rate, and percentage of shipments with predicted arrival time.
- Sustainable LogisticsPlanning and execution of transport, warehousing, and related flows to reduce environmental impact while meeting service, cost, and regulatory requirements. Work includes network design to shorten distance traveled, mode selection such as shifting volume to rail or ocean where feasible, higher vehicle utilization through consolidation and backhauls, and routing that limits empty miles and idling. Operations apply energy efficient equipment, alternative fuel or electric vehicles where available, packaging right sizing with recyclable materials, and controlled handling of wastes and refrigerants. Programs document methods and results with metrics such as grams of CO2 equivalent per ton mile, fuel per shipment, load factor, waste diversion rate, and refrigerant leakage, and keep records for audits and disclosures.
- Sustainable WarehousingOperation and design of a warehouse to reduce resource use, waste, and emissions while meeting safety and quality requirements. Practices include energy management with submetering, LED lighting with controls, improved insulation and door seals, and where installed on site power generation and storage. Materials management covers recyclable or reusable packaging, pallet pooling, and segregation of waste streams with documented handling of hazardous materials. Equipment steps include electric material handling, battery charging schedules, and maintenance that limits leaks of oils and refrigerants. Water and air measures include low flow fixtures, stormwater control, dust and noise limits, and refrigerant inventory with leak logs. Performance is reported with metrics such as kilowatt hours per order, water use per square foot, waste diversion rate, and greenhouse gas emissions by scope.