Before heavy deliberation, classify the decision as cheap or costly to undo; decide two-way doors fast and stage one-way doors to preserve options.

Reversibility Core rule: match process depth to undo cost. Most decisions are cheaper to reverse than they look; irreversible ones deserve deliberation and staged commitment. When to Use Uncertain how much analysis a decision deserves (tech, process, product, org) Tempted to committee a low blast radius choice, or to rush a high lock in one Can redesign the move (pilot, flag, abstraction, time box) to lower undo cost High stakes choice where acting vs waiting have asymmetric recovery profiles When NOT to Use Already classified this session—decide at matched depth; do not re label forever Trivial two way calls (names, local refactors) where deciding is cheaper than classifying Externally forced move with no optionality (hard deadline, contract, regulation) Correctness gates (security, data integrity) that need the right answer, not speed theater Procedure 1. Name the decision and undo path. State what would be committed and the concrete reverse move (rollback, migrate back, revoke, re hire, re contract). 2. Score reversibility. Assess technical effort, time, money, reputation, dependents, and learning lost if reversed. Classify: Type 2: undo in days, low cost → decide fast Type 1.5: undo in weeks, moderate cost → light structure + monitor Type 1: months or not realistically undoable → deliberate 3. Asymmetric downside / recovery. For Type 1 or 1.5: Acting wrong: downside, recoverable?, recovery cost Not acting: what permanently closes (window, exclusivity, path lock) Rule: recoverable acting downside + permanent inaction loss → staged commit over indefinite delay; catastrophic or third party harm → refuse or redesign first 4. Option preserving redesign. Prefer pilots, feature flags, interfaces, versioning, time boxed vendor terms, or strangler slices that convert Type 1 surface into Type 2 experiments. Deliberate only the residual irreversible core. 5. Match process and commit. Type 2: pick a reasonable option, ship, monitor. Type 1: document assumptions, argue the opposing case, surface to owner if stakes require it. Stop once class and commitment depth are set—do not re analyze without new undo cost evidence. Output Verification Falsify: If "we can always change later" has no concrete undo path and cost, treat as more irreversible until proven otherwise. Stop: After class and process depth are set, further taxonomy is waste—execute the matched process. Over application guard: Do not slow trivial Type 2 work with matrices. Do not use "two way door" to skip verification on irreversible data, security, or public commitments.

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