Choose the smallest number that still respects interruptions: often one deep work item and one light administrative card. Enforce with discipline. Lower WIP reveals bottlenecks, prevents half-finished mountains, and creates breathing room to fix root causes without sacrificing momentum or quality.
Under each column, add one-sentence rules: what must be true to pull work in, what done means, how to mark blocked. Keep them visible and forgiving. Policies help future-you make good choices when energy dips or urgencies scream.
Define three tags: Standard for regular flow, Fixed-Date for commitments, and Expedite for true fires. Limit Expedite strictly. When using it, pause something else. This language prevents everything from becoming urgent and protects strategic work from perpetual derailment.