Stop forgetting architectural decisions: make them executable

Source: Dev.to

The Problem: Lost Architectural Decisions

Most software projects don’t fail because developers can’t write code. They fail because decisions get lost.

Months or years later, the code still runs, tests pass, and systems appear healthy—but the reasoning behind key choices has vanished.

• Why was this library chosen?
• Why does this service behave this way?
• Was it a performance optimization, a business constraint, or a temporary workaround that became permanent?

What survives isn’t code clarity—it’s a set of unwritten rules remembered only by the people who were there at the beginning. This is an institutional memory problem. When intent disappears, every change becomes riskier, slower, and more expensive.

Teams don’t break architecture because they’re careless; they break it because the people who understood the original decisions leave, deadlines create constant pressure, documentation becomes outdated, and crucial decisions are buried in chat threads and pull requests rather than recorded formally.

Knowing why something was built is just as important as knowing how it works. Without that knowledge, teams guess—and systems slowly become harder and riskier to maintain.

If decisions are allowed to drift away from the code, they will eventually be forgotten. Architecture Decision Records (ADRs) only work when they are part of the developer’s daily workflow, close to the code, visible during reviews, and capable of surfacing when a rule is about to be broken. Otherwise, they become historical documents rather than living constraints.

A Vision: Executable Architecture

Imagine being able to ask your project:

Why is using an ORM forbidden here?

and getting a clear, consistent answer—not from a person who might be on vacation, but from the system itself. This would mean fewer repeated explanations, smoother onboarding, and less “architectural folklore”.

Introducing PHPDecide

PHPDecide is a CLI tool that treats architectural decisions as:

• Versioned artifacts in your repository
• Structured, machine‑readable knowledge
• Explainable constraints
• Optionally enforceable rules

Each decision captures:

Why Write Decision Files?

In some teams, leaders or senior developers resist because it feels like a loss of control. When knowledge lives only in their heads, they become gatekeepers. Relying on meetings and memory creates hidden risks:

• Knowledge silos and single points of failure
• Junior developers hesitate to ask
• Decisions get forgotten or unintentionally violated
• Reviews become debates about intent instead of implementation

Decision files shift authority from individuals to the team and the repository: transparent, explainable, and shareable.

Getting Started

1. Record 3–5 high‑signal decisions in the repository using PHPDecide.
2. Run the lint step in CI to validate decision files.
3. Use explain in code reviews for a month to surface relevant decisions.
4. Measure the impact – look for fewer repeated questions, faster onboarding, and more consistent reviews.

By making architectural decisions executable and discoverable, teams can preserve institutional memory, reduce risk, and keep their systems healthy over the long term.