Arden Koenig

Open with the business problem, not your preferred technology. Which people will use the system, how many times a day, and what does the process look like without it? An estimator who understands the goal can propose a cheaper route to it; someone handed only a list of screens can only price the list as written.

Describe the scope as concrete flows: who does what, and what happens next. Equally important, write down what you are not building. An explicit list of exclusions saves more friction during acceptance than almost anything else in the document. Also mark which items are decided and which are still open — estimators price uncertainty, and hiding it helps no one.

List the constraints. This means systems you must integrate with, the data you have and php frameworks speed comparison where it lives, compliance requirements, expected load, which devices matter and any technology you are committed to. Where a date is genuinely fixed, explain what drives it: an experienced team is usually able to resequence the work to meet it, but only if they know it exists.

Say what the word done means feature by feature. Clear acceptance criteria need not use special syntax: a short paragraph setting out what must be true when the feature works is sufficient. That one addition compresses acceptance testing considerably and closes off the usual argument at handover.

To close, state what you want in the response. Ask for a breakdown by feature or module, the assumptions behind each number, whatever the team considers risky and enterprise software development services an optimistic and a pessimistic figure. Treat a wide range as useful information rather than evasion: it tells you where your description is thin. Then tighten that section and ask for a new estimate — the next version tends to be the one worth planning around.