Begin with the reason this software solutions for government should exist, not your preferred technology. Who will use this, with what frequency, and how is the job done today? An experienced team who knows what is livewire you are trying to achieve often proposes an alternative that costs less; a team that receives only the requirements as given can only price your assumptions along with the work.
Define what is included as concrete flows: a walk through each important path. Just as important, list what is out of scope. An explicit list of exclusions prevents more argument at delivery node js real time development than the rest of the brief combined. Also mark which decisions are settled and which may still change — estimators price uncertainty, and pretending everything is fixed helps nobody.
Set out your constraints. This means systems you must integrate with, existing databases and their quality, regulatory obligations, expected load, target platforms and infrastructure that is already decided. Where a date is genuinely fixed, explain what drives it: a good team will often rearrange the plan to protect it, provided they hear about it early.
Say what completion means for the important items. Acceptance criteria do not require any formal notation: a plain-language note describing what a user should be able to do is enough. This single habit compresses the sign-off process dramatically and removes the usual argument at handover.
Finally, state what you want in the response. Request an itemised estimate, a written list of assumptions, the main risks and a low number and a high number. Take a broad range as information, not evasion: it usually points to the part of the brief that needs work. Then clarify that area and ask for a new estimate — the next version will be the one worth planning around.