Open with the business problem, not a list of screens. Who will use the system, with what frequency, and how is the job done today? An estimator who knows what you are trying to achieve will suggest a simpler way to reach it; someone handed only a list of screens will price exactly what you asked for.
Describe the scope as user stories or scenarios: what the user does and custom automation software development what the system does in response. Every bit as useful, write down what the first release deliberately excludes. A written out-of-scope list prevents more disagreement later than almost anything else in the document. Indicate as well which items are decided and software development rates which may still change — the difference changes the price, and concealing the open questions helps nobody.
Set out your constraints. This means systems you must integrate with, swift consulting services the data you have and where it lives, compliance requirements, traffic expectations, target platforms and any technology you are committed to. Where a date is genuinely fixed, explain what drives it: a good team is usually able to cut the right scope to protect it, provided they hear about it early.
Say what the word done means for the important items. Testable acceptance criteria do not require special syntax: a plain-language note setting out the expected behaviour is sufficient. This one section reduces acceptance testing dramatically and removes the most common source of disputes.
One last thing, say what you expect back. Ask for a breakdown by feature or module, the assumptions used, the main risks and a low number and a high number. Take a broad range as information, llm integration services not evasion: it normally identifies the part of the brief that needs work. Then tighten that section and request a revised number — the next version tends to be much more reliable.