The breakage of column WIP limits…
… instills the habit of discussing about the problems in the process.
Because breaking of column WIP limits occurs very frequently, the team activities that happen become a habit — and most of the times the activities involve reflection and introspection about the process being used (in addition to, naturally, the problems about the work being done).
Such reflective habits are the foundation for double-loop learning, which in turn is key in gaining superior organizational performance.
Read more in: Tame the Flow.