Documenting Project Requirements

A common belief in engineering teams is that a request already contains everything needed to start building. A sales representative, a customer, or a manager describes a feature, and the natural next step seems to be opening the documentation and beginning work. This belief is the misconception this article addresses. The request is a starting point, not a specification, and the details that matter most are often the ones nobody states out loud.

The difference matters because urgency and importance are not the same thing. A deadline can be real, or it can be a pressure created by someone who wants a deal closed. Without asking, the engineering team cannot tell which situation it is in, and it may spend weeks solving the wrong problem quickly.

Trace what happens to a request after it arrives. The request does not move straight to engineering. It passes a checkpoint where it can be stopped, redirected, clarified, or approved. The diagram below follows one request through that checkpoint. Each decision asks a question that the validation process needs answered before work begins. A request that fails the first question never reaches the implementation stage at all.

The gate has two kinds of outcome that are easy to confuse. A request can be stopped or redirected, meaning the real need does not justify the work or a simpler alternative already bridges the gap. Or it can be clarified, meaning the need is real but the requirements are still unknown. Only a request that survives both checks moves toward engineering. Reading the diagram from left to right shows the order: the team first decides whether to build, and only then decides what to build.

Scoping discipline means checking the requirements and assumptions behind a project before committing engineering work to it. It has two working parts that are closely connected. The first part decides whether to build. The second part shapes what to build. Each part is driven by a set of questions.

The source gives a real pattern that shows how costly a skipped assumption can be. A large enterprise customer needed a mobile reimbursement feature at a time when the mobile team was fully committed. Two engineers taught themselves development for both major mobile platforms and built both apps within a few weeks. Only later did they ask the customer for its list of Android beta users, and they learned that the customer requires all employees to carry iPhones. Most of the Android work was unnecessary.

The same wrong assumption costs very different amounts depending on when it is discovered. The timeline below follows the mobile reimbursement case from the requirements question through to the beta list. The source does not give numeric figures for how the cost grows, so the diagram shows only the order of events and what each stage produced. The point to read from it is that the one question that was cheap to ask came last.