One-way and two-way doors
Classifying decisions by how reversible they are. Deliberate carefully on one-way doors, which are hard to reverse. Move fast on two-way doors, which are reversible, and let the people closest to a two-way door make the call.
Evidence grade: practice A widely adopted practitioner model with clear provenance.
Use it when
Allocating scrutiny; deciding which decisions to delegate; setting intervention thresholds; staging big bets so that more of them become reversible.
Where it stops working
Reversibility is often misjudged, and "temporary" choices set hard. When in doubt, treat the door as one-way until it is proven otherwise.
Where the standard uses it
- PL-1Delegation, ownership, and decision rightsMatching scope to capability, making authority explicit, not taking work back.
- DE-4Managing scope, risk, and dependencies across workstreamsSeeing the whole, naming the risk, negotiating the boundary.
- TJ-1Evaluating architectural decisions and their organisational consequencesTrade-offs, reversibility, and who has to coordinate because of this.
- TJ-4Technical credibility and interventionStaying close enough to judge, and knowing when to step in.
Sources
- Jeff Bezos. 2015 Letter to Shareholders (Amazon.com, Inc.). Amazon.com, Inc., 2016. In the bibliography
Used alongside it
- Conway's law practice
- Task-relevant maturity practice
- Architecture review forums practice
- Contract at the boundary practice
- Ground truth and status criteria practice
- Installing a decision process practice
Cite this model
Chicago, BibTeX and licence →Engineering Management Academy. (2026). One-way and two-way doors. In Engineering Management Academy Body of Knowledge (Version 3.1, TEC.one-way-and-two-way-doors). https://www.engineeringmanagement.academy/body-of-knowledge/techniques/one-way-and-two-way-doors