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The term is used in supply chain management, and WIP is a key input for calculating inventory on a company's balance sheet. 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.
Constant work in process or CONWIP are pull-oriented production control systems.Such systems can be classified as pull and push systems (Spearman et al. 1990 [1]).In a push system, the production order is scheduled, and the material is pushed into the production line.
The ISO 15926 is an interoperability standard in the process industry.ISO 15926 includes the Work in Progress (WIP) database. [1] WIP is available online and includes technical class descriptions of all the main equipment items, pipe, instruments, buildings, activities and anything else used in engineering, constructing, procuring, operating and maintaining process facilities.
Where 'one process' factories exist, there is a market for the goods created, which establishes an independent market value for the good. Today, with multistage-process companies, there is much inventory that would once have been finished goods which is now held as 'work in process' (WIP).
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.
Work in process, also referred to as work in progress — an unfinished work; Wash-in-place, a method of cleaning the interior surfaces of closed industrial equipment (e.g. brewing, pharmaceutical, or chemical) without the need to disassemble them. See also the related Clean-in-place.
According to this classification different kinds of systems will have different customer order decoupling points (CODP), meaning that work in progress (WIP) cycle stock levels are practically nonexistent regarding operations located after the CODP (except for WIP due to queues). (See Order fulfillment.)
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.