Kanban process is based on 6 basic practices
- Visualise
- Limit work in progress.
- Manage flow.
- Make policies explicit.
- Implement feedback loops.
- Improve collaboratively, evolve experimentally.
If you reflect on these principles the premise essentially is to optimize the flow. Limiting WIP is a way to do that. There are no right or wrong numbers around what exactly should be the WIP limit of each column. All these numbers are bound to change dynamically and organically until the flow has been optimized.
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