Architecture Decision Records (ADR)

Overview

Architecture Decision Records capture important technical decisions, context, alternatives, and consequences.

Why ADRs Matter

ADRs preserve design rationale and reduce repeated debates during future changes.

flowchart TD
    A[Decision Needed] --> B[Evaluate Options]
    B --> C[Write ADR]
    C --> D[Implement Decision]
    D --> E[Review Outcomes]

ADR Template Example

# ADR-012: Adopt Message Broker for Async Events

## Status
Accepted

## Context
Order processing needs loose coupling and retry resilience.

## Decision
Adopt Kafka for event distribution between order, inventory, and notification services.

## Consequences
- Improved decoupling and replay capabilities
- Added operational complexity and monitoring requirements

Production Guidance

• Keep ADRs concise and decision-focused
• Link ADRs from pull requests and architecture docs
• Mark superseded ADRs explicitly

Common Pitfalls

• Writing ADRs without documenting tradeoffs
• Storing ADRs where teams cannot discover them
• Not updating ADR status when decisions change

Key Takeaways

• ADRs improve long-term architectural clarity.
• Decision context is as important as the decision itself.
• Lightweight, discoverable ADRs support team alignment.