# ADR Full Form and Meaning: Architecture Decision Record

> An ADR (Architecture Decision Record) is a document that captures an important architectural choice, the reasoning behind it, and its consequences.

- **Term:** ADR
- **Full form:** Architecture Decision Record
- **Part of speech:** abbreviation
- **Pronunciation:** /ˌeɪ.diːˈɑːr/
- **English level (CEFR):** B2
- **Register:** Neutral, Both
- **Region:** US and UK
- **Topic:** [Agile and project terms](https://app.speaktechenglish.com/learn/topics/agile-project-management-terms.md)
- **Lesson:** https://app.speaktechenglish.com/learn/adr
- **Last updated:** 2026-10-27

## Meaning

An ADR (Architecture Decision Record) is a document that captures an important architectural choice, the reasoning behind it, and its consequences. It serves as a historical record of why technical decisions were made.

ADRs are lightweight documents that teams use to document significant technical decisions and their trade-offs. Rather than storing this knowledge only in people's heads or scattered across emails and chat messages, ADRs create a permanent, searchable record that helps new team members understand the system architecture and why certain choices were made. Each ADR typically includes the decision, the context (problem being solved), the options considered, the chosen solution, and the consequences or trade-offs. ADRs are especially valuable in distributed teams and for long-term project sustainability, as they prevent repeated discussions of the same architectural questions and provide clear justification for design choices that might otherwise seem arbitrary to newcomers.

## When you hear it

We should create an ADR to document why we chose PostgreSQL over MongoDB for our database.

## Examples

- **in a design meeting:** "Before we move forward, we need to create an ADR explaining why we're switching to a serverless architecture."
- **in a code review:** "The ADR clearly states that we chose REST over GraphQL for API simplicity, so this implementation is correct."
- **in onboarding a new developer:** "Read the ADRs in our docs folder to understand the architectural decisions made over the past two years."

## What native speakers say

- "We should write an ADR for this decision"
- "Let me check the ADR for that architectural choice"
- "This ADR documents the reasoning behind our microservices approach"

## Common mistakes

- ✗ "We will use an ADR to decide between two database options." → ✓ "We will make a decision between two database options and then document it in an ADR." (ADRs document decisions already made, not the decision-making process itself. They record the outcome and reasoning.)
- ✗ "I wrote an ADR for the bug fix we shipped today." → ✓ "I wrote an ADR for our decision to refactor the authentication module." (ADRs are for significant architectural or technical decisions, not routine bug fixes or minor code changes.)
- ✗ "Our ADR says we should use microservices, so let us do it." → ✓ "Our ADR documents why we chose microservices for this system based on our scalability requirements." (ADRs explain the reasoning and context, not just the decision itself. They should help others understand the trade-offs.)

## Be careful

ADR is often confused with decision logs or design documents. ADRs specifically document the reasoning behind architectural choices, not all decisions. Do not use ADR for minor implementation choices.

## Word forms

| Part of speech | Word | Example |
| --- | --- | --- |
| noun | ADR | The ADR for our caching strategy is documented in the architecture folder. |
| noun | ADRs | Our team reviews ADRs during architecture discussions. |


## Collocations

- **write an ADR**: Used when creating a new architecture decision record
- **document in an ADR**: Describing the act of recording a decision formally
- **ADR proposes**: When referring to the suggestion or solution within an ADR
- **follow the ADR**: Implementing the decision documented in an ADR
- **review the ADRs**: Examining existing architecture decision records

## Synonyms

- **design decision log**: Broader term for documenting design choices; ADR is more specific and structured
- **decision record**: General term; ADR specifically focuses on architectural decisions
- **architecture documentation**: Broader category that may include ADRs along with other documentation

## Practice

This lesson has 4 practice exercises with instant feedback on the page: https://app.speaktechenglish.com/learn/adr

## FAQ

### What does ADR stand for?

ADR stands for Architecture Decision Record. It is a document that captures an important architectural decision made by a software development team, including the context, the options considered, and the reasoning behind the choice.

### What should I include in an ADR?

A typical ADR includes: Title (the decision), Status (proposed, accepted, deprecated), Context (the problem or situation), Decision (what was chosen), Consequences (trade-offs and implications), and sometimes Alternatives (options that were considered). The structure may vary between teams.

### When should we write an ADR?

Write an ADR when making significant architectural or technical decisions that affect the system design, such as choosing a database technology, adopting a new framework, switching to microservices, or changing your authentication approach. Do not write ADRs for minor implementation details or routine bug fixes.

### How long should an ADR be?

ADRs should be concise but complete, typically one to three pages. The goal is to be clear and informative without unnecessary length. Include enough detail to explain the reasoning to someone unfamiliar with the decision.

### Are ADRs formal or informal?

ADRs are semi-formal documents. They are more structured than casual chat messages but less formal than comprehensive technical specifications. They balance clarity with brevity, making them practical for busy teams.


## Related

- [Technical Debt](https://app.speaktechenglish.com/learn/technical-debt.md)
- [Decision Log](https://app.speaktechenglish.com/learn/decision-log.md)
- Full glossary: https://app.speaktechenglish.com/learn.md
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