A new software project often begins with a long list of features. Lists are easy to expand and difficult to disagree with. A dashboard, notifications, an assistant and a mobile experience may all sound useful. Together, they still do not explain whose problem the first release will solve.
A good brief makes that explanation concrete. It should help a team decide what to build, what to defer and what evidence would change the plan.
Describe one real situation
Start with a person, a task and a source of friction. “A small operations team needs to identify delayed jobs before customers ask about them” is a more useful starting point than “build an intelligent dashboard.” The first statement suggests a workflow that can be observed and tested.
Describe the current workaround too. A spreadsheet, a daily call or a series of copied messages may already solve part of the problem. Understanding that behavior helps preserve what works instead of replacing it merely because a new interface is possible.
Then define a visible result. What should the person be able to do at the end of the first version that they cannot do reliably today?
Separate decisions from assumptions
Some constraints are known: the application must integrate with a particular system, serve a certain audience or operate within a budget. Others are guesses: users will check it daily, data will be complete, or an automated recommendation will be welcome.
Write these separately. A fixed constraint guides implementation. An assumption needs a test. Mixing them can turn an unproven preference into an expensive architectural commitment.
For each major assumption, choose the cheapest useful check. That might be reviewing sample data, walking through a prototype or building a narrow integration. It does not always require a production application.
Define the first slice and its owner
A first slice should connect an input to a useful outcome. Include the awkward edges that determine whether it works: an empty result, missing data, a failed request and a way to recover. A polished happy path alone can conceal the real complexity.
Agree who makes product decisions, who supplies domain knowledge and who maintains the system after delivery. This matters in consulting projects and even more in potential co-founder collaborations, where ongoing responsibilities shape the partnership.
The brief does not need to be long or permanent. A page with a clear situation, outcome, boundaries, assumptions and next test can be enough. Its value is that the team can read it, challenge it and use it to make the next decision together.