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In lean thinking, inappropriate processing or excessive processing of goods or work in process, "doing more than is necessary", is seen as one of the seven wastes (Japanese term: muda) which do not add value to a product. [9] [10]
The partially completed work (or work in process) is a measure of inventory built during the work execution of a capital project, [9] [10] [11] such as encountered in civilian infrastructure construction or oil and gas. Inventory may not only reflect physical items (such as materials, parts, partially-finished sub-assemblies) but also knowledge ...
For example, no part is allowed to enter the system without a card (authority). After a finished part is completed at the last workstation, a card is transferred to the first workstation and a new part is pushed into the sequential process route. In their paper, Spearman et al. (1990) used a simulation to make a comparison among the CONWIP ...
A third issue comes from the view that inventory also serves the function of decoupling two separate operations. For example, work in process inventory often accumulates between two departments because the consuming and the producing department do not coordinate their work. With improved coordination this buffer inventory could be eliminated.
In kanban, problem areas are highlighted by measuring lead time and cycle time of the full process and process steps. [5] One of the main benefits of kanban is to establish an upper limit to work in process (commonly referred as "WIP") inventory to avoid overcapacity. Other systems with similar effect exist, for example CONWIP. [6]
Work in process; Finished goods; A good purchased as a "raw material" goes into the manufacture of a product. A good only partially completed during the manufacturing process is called "work in process". When the good is completed as to manufacturing but not yet sold or distributed to the end-user, it is called a "finished good". [1]
CONstant work in process (CONWIP) is a pull system because it limits WIP via cards similar to kanban. An important difference from kanban from an implementation standpoint is that the cards are line specific rather than part number specific. However, from a push-pull perspective, CONWIP cards limit WIP in the same manner as kanban cards.
For example, BAE Systems, Platform Solutions (Fort Wayne, Ind.), producing aircraft engine monitors and controls, implemented cells for 80 percent of production, reducing customer lead time 90 percent, work-in-process inventory 70 percent, space for one product family from 6,000 square feet to 1,200 square feet, while increasing product ...