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Theory of Constraints


Inventory

Inventory is all the money that the system has invested in purchasing things which it intends to sell.” (chapter 8 The Goal) Other Definitions Inventory – Stock on hand; often divided between raw materials inventory, work-in-process , and finished goods...

Feeding Buffer

A time buffers placed in project chains (paths) that tie in to the critical chain. Their purpose is to help insure that the successor task on the critical chain has all of its inputs with about a 50% probability. Size the feeding buffers based on the tasks in the...

Drum Buffer

Is only used in multi-project implementations. Its purpose is to exploit the early availability of the drum resource by assuring all of the input tasks are complete if the drum resource completes its task in the predecessor project early.

Drum-Buffer-Rope (DBR)

This is the term applied to the “Constraint Management” approach to scheduling in manufacturing systems, developed by Eli Goldratt and popularized in the novel, “The Goal.”   The “drum” refers to the rate at which the primary bottleneck, or determining constraint, can...

Drum

Part of Drum-Buffer-Rope Scheduling. A name given to the rate of production of a physical constraint. The beat of the drum dictates the rate that material should flow into the system. (http://www.tocpractitioner.com/tocglossary.asp) Other Definitions Drum – The Drum...