Open with the reason this custom software development moscow should exist, not a list of screens. Who will use the system, how often, and what happens today? A vendor who understands the goal can propose an alternative that costs less; a team that receives only the requirements as given prices exactly what you asked for.

Describe the scope as concrete flows: who does what, and what happens next. Every bit as useful, write down what you are not building. An explicit list of exclusions removes more disagreement later than almost anything else in house vs outsourcing software development the document. Also mark which items are decided and which are still open — the difference changes the price, and hiding it helps no one.

Set out your constraints. The list covers systems you must integrate with, the data you already hold and its condition, compliance requirements, expected load, target platforms and infrastructure that is already decided. If a deadline is real, say why: a team is usually able to cut the right scope to protect it, provided they hear about it early.

Write down what the word done means feature by feature. Clear acceptance criteria do not require any formal notation: a plain-language note describing the expected behaviour is enough. This one section compresses acceptance testing by a surprising margin and removes most late-stage disagreement.

To close, say what you expect back. Require an itemised estimate, the assumptions behind each number, the main risks and a range rather than a single figure. Treat a wide range as useful information rather than evasion: sla based software support it tells you the part of the brief that needs work. Then clarify that area and request a revised number — the second estimate will be much more reliable.