Abc analysis: a classification of items in an inventory according to importance defined in terms of criteria such as sales volume and purchase volume. Abc classification

RMA: Return Material Authorization. Also see: Return Product Authorization.
ROA: See Return on Assets.
Roof Fairings: An integrated air deflector mounted on the top of the cab.
Root Cause Analysis: Analytical methods to determine the core problem(s) of an organization, process, products, market, etc.
Route Trucks Delivery: Trucks that travel fixed routes.
Routing or Routing Guide: (1) Process of determining how shipment will move between origin and destination. Routing information includes designation of carrier(s) involved, actual route of carrier, and estimate time en route. (2) Right of shipper to determine carriers, routes, and points for transfer shipments. (3) In manufacturing, this is the document which defines a process of steps used to manufacture and/or assemble a product.
Routing Accuracy: When specified activities conform to administrative specifications, and specified resource consumptions (both man and machine) are detailed according to administrative specifications and are within 10% of actual requirements.
RTV: See Return to Vendor (RTV).
Rules: Documented definitions of how work is to be performed.
S
S&OP: See Sales and Operations Planning.
SAE: Society of Automotive Engineers
Safety Stock: The inventory a company holds above normal needs as a buffer against delays in receipt of supply or changes in customer demand.
Salable Goods: A part of assembly authorized for sale to final customers through the marketing function.
Sales and Operations Planning (S&OP): A strategic planning process that reconciles conflicting business objectives and plans future supply chain actions. S&OP usually involves various business functions, such as sales, operations, and finance to agree on a single plan/forecast that can be used to drive the entire business.
Sales Mix: The proportion of individual product-type sales volumes that make up the total sales volume.
Sales Plan: A time-phased statement of expected customer orders anticipated to be received (incoming sales, not outgoing shipment) for each major product family or item. It represents sales and marketing management's commitment to take all reasonable steps necessary to achieve this level of actual customer orders. The sales plan is a necessary input to the production planning process (or sales and operations planning process). It is expressed in units identical to those used for the production plan (as well as in sales dollars). Also see: Sales and Operations Planning.
Sales Planning: The process of determining the overall sales plan to best support customer needs and operations capabilities, while meeting general business objectives of profitability, productivity, competitive customer lead times, and so on, as expressed in the overall business plan. Also see: Sales and Operations Planning.
Sawtooth Diagram: A quantity-versus-time graphic representation of the order point/order quantity inventory system showing inventory being received, used up, and reordered.
Scalability: