Document Architecture Decisions That Actually Get Followed
Architecture Decision Records are the difference between architecture that gets adopted and architecture that gets ignored. Most architects document what was decided; great architects document why it was decided, what alternatives were considered, and what conditions would cause them to revisit the decision. ADRs transform architecture from a top-down mandate into an engineering team's shared context.
An ADR that doesn't explain the trade-offs considered and the conditions for revisiting the decision is just a memo. Document the decision context, the alternatives, the consequences, and the triggers for change.
Of architecture decisions are reversed within 2 years due to poor documentation
ThoughtWorks researchFaster onboarding for engineers when architecture decisions are documented with context
Industry survey dataMedian base salary for Solutions Architects at enterprise tech companies
Industry dataIs this guide for you?
Use this Good fit if you…
- ✓You're establishing or improving architecture governance in your organization
- ✓Engineering teams are making inconsistent technical choices
- ✓You need to communicate architecture decisions to non-technical stakeholders
Skip Not the right fit if…
- ✗You're working on a small team where informal communication suffices
- ✗Architecture decisions are stable and undisputed
- ✗You're targeting a role where architecture governance isn't a responsibility
The playbook
Five things to do, in order.
Define the decision context with constraint clarity
What are the forces at play — performance requirements, team skills, timeline, cost constraints, compliance requirements? A decision made without explicit constraints will be second-guessed by every engineer who didn't participate.
Document at least three alternatives considered
If you only document the chosen option, you don't have an ADR — you have a memo. The alternatives (and why they were rejected) are the most valuable part for the engineers who inherit the system in 18 months.
State consequences honestly — including negative ones
"This decision trades operational simplicity for scalability. We'll need a database migration at 10M users." Honest consequence documentation builds trust and prevents the architecture from being abandoned quietly when the negative consequences appear.
Define the conditions for revisiting
"Revisit if team grows beyond 50 engineers, if latency SLA tightens to <100ms, or if the primary vendor raises pricing >20%." These triggers prevent outdated decisions from being followed religiously long after the context changed.
Get the ADR reviewed by the engineers who will implement it
An architecture decision that surprises the implementation team is an architecture decision that will be worked around. Review creates buy-in and surfaces implementation concerns that change the decision.
See the transformation
"We decided to use a microservices architecture for the new platform."
"ADR-042: Event-driven microservices over synchronous REST for the order processing domain. Context: 3 teams, 50K orders/day, P99 latency requirement <500ms, team has Kafka expertise. Alternatives: synchronous REST (rejected: tight coupling, cascading failures), monolith (rejected: team autonomy requirements). Consequences: operational complexity of Kafka, eventual consistency in order status. Revisit trigger: if team size drops below 15 engineers or latency SLA tightens to <100ms."
Questions people ask
How do I get engineers to write ADRs without it becoming bureaucracy?
Keep the format lightweight: context, decision, alternatives, consequences. One page maximum. If writing the ADR takes more than 30 minutes, the template is too complex. ADRs should capture thinking, not replace it.
Should every technical decision get an ADR?
No. ADRs are for decisions that are consequential, hard to reverse, or likely to be questioned. Library choice for a minor utility doesn't need an ADR. Database selection for a core service does.
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