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Architecture

Architecture Decision Record Template

Template for documenting architectural decisions with emphasis on explaining rationale and context

Architecture Decision Record (ADR) Template

Overview

Architecture Decision Records (ADRs) help our team document important architectural choices, their context, and most importantly, the reasoning behind them. This creates a valuable knowledge base that helps current and future team members understand not just what we decided, but why we made those choices.

Why ADRs Matter: ADRs prevent "archaeology" - the need to dig through old code and commits to understand why things are the way they are. They capture the context and constraints that influenced our decisions, which often gets lost over time.

ADR Structure

ADR-[NUMBER]: [Descriptive Title]

Date: [YYYY-MM-DD]
Status: [Proposed | Accepted | Deprecated | Superseded]
Deciders: [List of people involved in the decision]
Technical Story: [Ticket/Issue reference if applicable]

Context and Problem Statement

[Describe the situation that necessitates this decision. What challenge are we facing? What opportunity are we addressing? Write this in 2-3 clear sentences that someone new to the project could understand.]

Why is this decision necessary?

[Explain the importance and urgency of making this decision. What happens if we don't address this? What pain points does it solve? This section helps readers understand the motivation.]

Decision Drivers

Key factors influencing our decision:

  • [Driver 1 - e.g., Performance requirements]
  • [Driver 2 - e.g., Team expertise]
  • [Driver 3 - e.g., Time constraints]
  • [Additional drivers as needed]

Considered Options

We evaluated the following approaches:

  1. [Option 1 Name] - [Brief description]
  2. [Option 2 Name] - [Brief description]
  3. [Option 3 Name] - [Brief description]

Decision Outcome

Chosen option: "[Selected Option]"

We selected this option because [provide clear justification linking back to the decision drivers].

Why this option?

[Provide detailed explanation of why this option best addresses our needs. Include:

  • How it satisfies our key requirements
  • What trade-offs we're accepting
  • Why other options were less suitable]

Consequences

Positive Outcomes

  • [Benefit 1 - e.g., Improved developer experience]
  • [Benefit 2 - e.g., Better performance]
  • [Additional benefits]

Trade-offs and Considerations

  • [Trade-off 1 - e.g., Increased complexity in certain areas]
  • [Trade-off 2 - e.g., Additional learning curve]
  • [Other considerations]

Implementation Details

File Structure Impact

# Show how this decision affects project organization
src/
├── core/
│   └── [new/modified structure]
└── features/
    └── [affected areas]

Code Examples

// Current implementation approach
[Show existing pattern or structure]

Validation

How we'll measure success:

  • [Metric 1 - e.g., 50% reduction in related bugs]
  • [Metric 2 - e.g., New developer onboarding time under 2 days]
  • [Metric 3 - e.g., Decreased "where does this go?" questions]
  • [Link to related ADRs]
  • [Link to implementation documentation]
  • [Link to example implementations]