Detect stale assumptions in an architecture decision record (ADR) by checking its context, rationale, requirements, constraints, dependencies and expected consequences against current evidence. Review when those inputs or outcomes change—not simply because the ADR is old. Keep the accepted decision’s history, and use a linked superseding ADR when a material change calls for a new decision.
What makes an ADR assumption stale?
An ADR records a significant architectural decision, the context in which it was made and the consequences expected from it. Its rationale lets future teams assess whether the decision still fits. Microsoft Learn cautions that “A record without justification loses its value over time as stakeholders can’t evaluate whether the decision still applies when circumstances change.” (Maintain an architecture decision record (ADR).)
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An assumption is worth revisiting when the facts that supported the choice have changed, or when the outcome differs materially from what the record anticipated. The date on the ADR is not, by itself, evidence that the decision is invalid. The cited guidance establishes no universal expiry period or review interval.
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Find the decision, status and owner
Locate the ADR in the team’s version-controlled documentation or decision index. Note its status, decision owner, related requirements and risks, and any links to related or superseding records. AWS guidance assigns active maintenance to an owner; keeping these references discoverable helps a reviewer trace the decision’s history.
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Turn the rationale into checkable claims
Extract the assumptions from the context and rationale. For example: “The service must meet requirement X,” “dependency Y supports capability Z,” “this option meets the availability target,” or “the expected consequence is reduced operational effort.” These are illustrative examples, not quotations. Record the original requirements, constraints, expected benefits and costs, and the conditions that made this option preferable.
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Look for events that should trigger review
Check whether any of the following has changed since the decision:
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- Requirements, constraints or quality-attribute targets.
- A dependency, API, platform or vendor capability.
- Security needs or operational conditions.
- Observed consequences, costs or benefits compared with what the ADR expected.
- Implementation status, especially if the decision remains incomplete.
- Technical or operational evidence that was not available when the choice was made.
GOV.UK’s Architectural Decision Record Framework says to “Regularly review and update the ADR (Architectural Decision Record (ADR)) to reflect any changes in the context or consequences of the decision.” It does not set a universal cadence.
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Compare current evidence with the original rationale
For each claim, identify what remains true, what no longer holds and which trade-offs have shifted. Check current requirements, platform and vendor capabilities, operational results, security needs and implementation status against the evidence recorded when the team chose the option. Include alternatives and confidence in the comparison; do not treat an unsupported recollection as proof.
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Record the review outcome
If current evidence still supports the decision, record the review date and evidence in line with the team’s practice. If the decision is proposed or unimplemented, follow the team’s lifecycle rules for clarifying or revising it. When an accepted, implemented decision needs to change, preserve the original and create a reviewed ADR that explains the new basis and links to the earlier record as superseded.
Choose an update policy that preserves the right history
ADR conventions differ, so teams should define their lifecycle rather than assume one universal update rule. The key distinctions are how the team protects history, how mature the decision is and how reviews are triggered.
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| Policy question | Approaches in the guidance | Practical implication |
|---|---|---|
| How is history preserved? | AWS and Microsoft favor immutable or append-only accepted records with a new superseding ADR when a decision changes. The community repository describes teams that add dated information to a living record. | Choose whether accepted records are preserved as historical decisions or maintained as evolving documents; make later changes traceable either way. |
| Does decision maturity matter? | GDS allows some clarification before implementation and recommends a new ADR after implementation has occurred. AWS describes creating a new ADR when an accepted decision changes. | State how proposed, accepted, rejected, implemented and superseded decisions are handled. |
| When is a review due? | DGOV’s template includes a review-date field. GOV.UK calls for regular review when context or consequences change but gives no universal interval. | Use explicit review dates, event-based triggers or both, according to the decision’s risks and the team’s process. |
Make the next review easier
Write ADRs so a future reviewer can reconstruct not just what was chosen, but why it made sense at the time. Include the relevant context, rationale, requirements, constraints, consequences and supporting evidence. Where useful, also record confidence, trade-offs, risks, owner, status and links to related requirements. Review is part of the ADR lifecycle: AWS emphasizes an owner’s maintenance role, while GDS calls for regular discussion of decisions that have not been fully implemented.
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