A WIP Limit caps the maximum number of items that may simultaneously occupy a column on the Kanban board. It is the most important element in Kanban because it regulates the entire flow of work. Without WIP Limits, a Kanban board degrades into a mere task list where everything is visible but nothing is controlled.
If the “In Development” column has a WIP Limit of three, no more than three items may be in progress at the same time. Only when an item is completed and moves to the next column may a new one be pulled in. This sounds restrictive but has a mathematically grounded effect: according to Little’s Law, less parallel work leads to shorter cycle times. Teams that introduce WIP Limits typically find that individual items are completed faster, precisely because fewer items are started simultaneously. WIP Limits also expose bottlenecks, as congestion in front of specific columns becomes visible.
WIP Limits originate from the Toyota Production System and were adapted for knowledge work by David Anderson. The right level is team-specific and determined through experimentation.
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