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TIME BUCKET. A predefined period of time used for production planning. For MRP, the number of days summarized into one columnar display. A weekly time bucket would contain all of the relevant planning data for an entire week. (See BUCKETLESS SYSTEMS.)
TIME FENCE. A policy or guideline established to note when various restrictions or changes in operating procedures may take place.
TIME-PHASED ORDER POINT (TPOP). An application of MRP for independent demand items, gross requirements coming from a forecast not via explosion. This technique can be used to plan warehouse inventories as well as planning for service (repair) parts since MRP logic can readily handle items with dependent demand, independent demand or a combination of both. (See DISTRIBUTION REQUIREMENTS PLANNING.)
TIME PHASING. The staggering of production of an assembly's components such that all components are available at the correct time for sub- and final assembly.
TIME STANDARD. A preset, known amount of time allowed for performing an operation.
TOP-DOWN PLANNING. An organizational approach to MRP planning in which the individual scheduling the top level assemble also schedules all lower-level components, regardless of commodity. This approach ensures schedule continuity up and down the BOM structure.
TPOP. (See TIME-PHASED ORDER POINT.)
TRANSIENT BILL OF MATERIAL. A bill of material coding and structuring technique used primarily for transient (non-stocked) sub-assemblies. For the transient sub-assembly item, lead time is set to zero and lot-sizing is lot-for-lot. This permits MRP logic to drive requirements straight through the transient item to its components, but retains its ability to net against any occasional inventories of the sub-assembly. This technique also facilitates the use of common bills of material for engineering and manufacturing. Syns: phantom bill of material, blow through.
TRANSIT INVENTORY. Inventory that is being transferred from one site to another.
TRANSIT TIME. A standard time allowance for the physical movement of items from one operation to the next. (See MATERIALS HANDLING TIME.)
TRANSPORTATION INVENTORY. Inventories that exist because material must be moved. For example, if it takes two weeks to replenish a branch warehouse, transportation of two weeks of sales will normally be in transit.
TRAVELING PURCHASE REQUISITION. A purchase requisition designed for repetitive use. After a purchase order has been prepared for the goods requisitioned, the form is returned to the originator who holds it until a repurchase of the goods is required. The name is derived from the repetitive travel between the originating and purchasing departments. Syn: traveling requisition.
TRAVEL REQUISITION. (See TRAVELING PURCHASE REQUISITION.)
TURNS. (See INVENTORY TURNOVER.)
TWO BIN SYSTEM. A type of fixed order system in which inventory is carried in two bins. A replenishment quantity is ordered when the first bin is empty. When the material is received, the reserve bin is refilled and the excess is put into the working bin. This term is also used loosely to describe any fixed order system even when physical "bins" do not exist.
TWO-LEVEL MPS. A master production scheduling approach wherein a super bill of material is master scheduled along with selected key options, features and attachments.
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