Understanding Architecture Decision Records (ADR)

Every architecture is just the sum of its decisions. The schema choices, the environment strategy, the integrations you accepted and the ones you ruled out. Thousands of calls — most of them made under pressure, half of them forgotten within six months.

So are you recording yours..?

Some decisions are celebrated, some quietly regretted. The Architecture Decision Record (ADR) is the artefact that turns those calls into institutional memory, not tribal knowledge. In this blog, we’ll unpack what it is, what makes a great one, and how it applies directly to Power Platform. Stick around — there’s a downloadable template at the end.

It is one of the most important deliverables of a solution architect. Without it, future architects — including future-you — are left reverse-engineering logic from artefacts that were never designed to explain themselves.

The ADR documents all key decisions, including alternatives that you ruled out, for architecturally significant requirements

Each entry captures the context, justifications, and implications of a decision, incorporating requirements and constraints into the documented effects of the decision.

An Architecturally Significant Requirement (ASR) is a requirement that has a measurable effect on the architecture and quality of a software and/or hardware system. An Architectural Decision Record (ADR) captures a single AD and its rationale; Put it simply, ADR can help you understand the reasons for a chosen architectural decision, along with its trade-offs and consequences. 

• ADR serves as an append-only log
• Don’t go back and edit accepted records
• preserve the history of your thinking and makes it clear when and why the direction shifted

A record should include consistent elements such as:

• Problem statement with context
• Options considered
• Decision outcome
• Include important tradeoffs made with this decision
• Record the confidence level of the decision. Sometimes an architecturally significant decision is made with relatively low confidence. Documenting that low confidence status could prove useful for future reconsideration decisions.
• Status, such as Proposed, Accepted, or Superseded. Tracking status makes the current state of each decision clear, especially as the number of decisions grows.
• Break one decision into multiple if an architectural decision is going to result in multiple phases, such as short-term, mid-term, long-term approaches. Log each phase as its own decision record.
• Avoid hiding consequences of decisions intentionally or accidentally.

Here is a template which you can follow…

ADRs in the Power Platform world

On Power Platform engagements — where architecture decisions span Dataverse schema design, environment strategy, ALM topology, Copilot Studio integration, and governance — ADRs are especially powerful. The platform evolves rapidly; what was best practice eighteen months ago may be superseded today. A well-maintained ADR log tells the next architect why you chose managed vs. unmanaged layers, why you opted for canvas over model-driven, or why the COE Starter Kit was accepted and later superseded by a custom governance model.

Hope you got an understanding about ADR…please check out the references further if necessary.

References:

https://adr.github.io

https://learn.microsoft.com/en-us/azure/well-architected/architect-role/architecture-decision-record

https://learn.microsoft.com/en-us/azure/well-architected/architect-role/fundamentals