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WIP refers to the number of items currently waiting to be worked on in a process. WIP can refer to the number of items in an inbox or queue. Often referred to as “inventory” in manufacturing processes.

For a better understanding of WIP (aka Work-In-Process) and an overview of Lean Six Sigma, check out our Free Lean Six Sigma Yellow Belt Training, Green Belt Training or Lean Training.

Elisabeth Swan

Elisabeth is a Managing Partner at, the co-author of The Problem-Solver’s Toolkit and co-host of the Just-in-Time Cafe. For over 25 years, she's helped leading organizations like Amazon, Charles Schwab and Starwood Hotels & Resorts build problem-solving muscles with Lean Six Sigma to achieve their goals.