Architecture Decision Records in English: Structure, Language, and Templates
Learn how to write Architecture Decision Records in clear English: ADR structure, vocabulary for each section, hedging language for trade-offs, and ready-to-use templates.
An Architecture Decision Record (ADR) is a short document that captures a significant architectural decision: what was decided, why, and what the consequences are. ADRs are widely used in engineering teams, but writing them clearly in English — especially when weighing trade-offs or acknowledging uncertainty — requires specific vocabulary and phrasing. This guide gives you the structure, the language, and the phrases you need.
ADR Structure
A standard ADR contains four core sections. Understanding the purpose of each section helps you write more focused, useful content.
1. Context
The context section describes the situation that necessitates a decision. It is factual and neutral — you are not arguing for a solution yet, just explaining what is true and what forces are at play.
Useful vocabulary for context:
- Force — a competing concern or constraint shaping the decision. “The main forces at play are scalability, operational complexity, and cost.”
- Constraint — a limitation that is fixed and cannot be changed. “We are constrained to AWS services due to our existing enterprise agreement.”
- Driver — a business or technical need motivating change. “The primary driver for this decision is the need to support 10× the current peak traffic within six months.”
- Assumption — something believed to be true but not yet verified. “We assume the team will grow to eight engineers within the next quarter.”
2. Decision
The decision section states what was chosen, written as an active, unambiguous statement.
Recommended phrasing:
- “We will use X.”
- “We have decided to adopt X.”
- “The team has agreed to implement X.”
Avoid vague language like “we might consider X” or “X could potentially be used.” The decision section must be definitive.
3. Status
Status reflects the lifecycle of the ADR:
- Proposed — under discussion, not yet agreed
- Accepted — agreed and in effect
- Deprecated — superseded by a newer decision
- Superseded by ADR-042 — replaced by a specific record
4. Consequences
Consequences describe what becomes easier, harder, or different as a result of the decision. This is where you acknowledge trade-offs honestly.
Hedging Language for Trade-offs
Good ADRs acknowledge uncertainty and describe trade-offs without either over-promising or being evasive. Hedging language is the key tool here.
Acknowledging positives and negatives:
- “This approach simplifies X but introduces additional complexity in Y.”
- “Whilst this increases operational overhead, it significantly reduces latency.”
- “The main drawback is X; however, this is an acceptable trade-off given Y.”
Expressing uncertainty:
- “It is anticipated that…” (moderate confidence)
- “We expect that, under normal load, …” (conditional expectation)
- “This assumption will need to be validated once…” (deferred validation)
- “There is a risk that X may occur if Y.” (risk framing)
Describing future consequences:
- “Teams consuming this service will need to update their client libraries.”
- “This decision closes off the option to use X in the future.”
- “Reversing this decision at a later date would require a full re-migration.”
Vocabulary for Each ADR Section
| Section | Key terms |
|---|---|
| Context | force, driver, constraint, assumption, trade-off, background |
| Decision | adopt, implement, migrate to, replace with, deprecate, retire |
| Status | proposed, accepted, deprecated, superseded, under review |
| Consequences | enables, prevents, requires, increases, reduces, introduces risk |
Example ADR Sentences in Context
-
“The primary driver for this decision is the need to eliminate the single point of failure introduced by our current monolithic session store.” (Context)
-
“We will adopt a distributed Redis Cluster managed by our infrastructure team, replacing the current single-instance Redis deployment.” (Decision)
-
“Status: Accepted — agreed by the backend chapter lead and platform team on 2026-04-01.” (Status)
-
“This approach simplifies horizontal scaling but introduces an operational dependency on the platform team for cluster management; application teams will no longer be able to self-serve Redis changes.” (Consequences — trade-off)
-
“Reversing this decision in the future would require migrating session data back to a single-instance model, which is feasible but would incur significant engineering effort during a traffic-sensitive migration window.” (Consequences — reversibility)
Template to Use Immediately
# ADR-[NUMBER]: [Short decision title]
**Date:** YYYY-MM-DD
**Status:** Proposed | Accepted | Deprecated | Superseded by ADR-[N]
## Context
[Describe the situation. What is happening? What forces, constraints, and drivers are at play?]
## Decision
We will [state the decision clearly and actively].
## Consequences
**Positive:** [What becomes easier or better?]
**Negative:** [What becomes harder or introduces risk?]
**Neutral:** [What changes but is neither clearly positive nor negative?]Common Writing Mistakes in ADRs
Too vague: “We decided to improve performance.” → Better: “We will replace synchronous HTTP calls between Service A and Service B with asynchronous messaging via RabbitMQ.”
Missing consequences: Simply stating a decision without explaining its impact reduces the long-term value of the ADR enormously.
Passive throughout: “It was decided that Redis would be used.” → Better: “The backend chapter agreed to use Redis.”
Write ADRs in present and future tense for decisions, past tense only for historical context. Keep each record short — a useful ADR is typically one page, not five.
Navigating Nuance: ADRs for Non-Native Speakers
Architecture Decision Records (ADRs) are a powerful tool for documenting the why behind technical choices. But for developers whose first language isn’t English, the precision and often abstract nature of ADR writing can feel particularly challenging. It’s not just about conveying information; it’s about establishing a shared understanding within a team that relies heavily on clear, unambiguous communication. Let’s look at how to bridge this gap, focusing specifically on the nuances of phrasing and vocabulary that might trip up non-native speakers.
One common issue is overusing overly formal language. While accuracy is paramount, constantly employing phrases like “utilize” or “implement” can sound stilted in a collaborative environment. Instead, consider simpler alternatives. For example, instead of saying “We should utilize a microservices architecture,” you might say, “Let’s build this with separate services – it seems like the best way to handle future scaling.” This shift towards more conversational phrasing immediately makes the ADR more approachable and less intimidating. Similarly, terms like “robustness” can be replaced with explanations of what that actually means within the context: “We need to ensure the system can handle a large number of concurrent users without performance degradation.”
Another area requiring careful attention is hedging language when discussing trade-offs. ADRs are inherently about acknowledging competing priorities. Phrases like “This is the optimal solution” or “The best approach is…” can sound overly assertive and dismissive of alternative viewpoints, particularly if team members have different perspectives shaped by their native linguistic backgrounds. Instead, use phrases such as “Considering our constraints, this appears to be a reasonable balance,” or “While this option offers [benefit], it also presents the challenge of [potential drawback]. We should investigate…”. Framing trade-offs as ‘opportunities and challenges’ rather than ‘pros and cons’ is often more effective in conveying a balanced perspective.
Finally, pay close attention to how you phrase questions. Asking “What are the implications of this decision?” can be interpreted very literally. A better approach might be, “How will this choice affect our ability to deliver features quickly?” or “What potential risks do we need to consider as we move forward with this design?”. Remember, the goal is to facilitate discussion and ensure everyone understands the reasoning behind the decisions being made. Practicing clear, direct communication, even when discussing complex technical matters, will significantly improve your ADRs and contribute to a more collaborative team environment.