Five avoidable mistakes in a prototype brief
Many project delays begin with an unclear requirement. A few small decisions at the start can make later reviews much more useful.
1. Leaving the purpose undefined
“A prototype” can mean a visual model, a fit-check sample or a functional experiment. Explain the question it should answer and identify who will review it.
2. Assuming dimensions are obvious
State the units and overall size. Mark critical dimensions and identify any component the part must mate with. An attractive rendering does not replace a dimensioned reference.
3. Discussing finish too late
Explain which faces will be visible and what appearance you expect. A reference photo or physical sample can be useful. Agree whether finishing is part of the initial scope.
4. Losing track of revisions
Use a revision name for the model and its matching drawing. When a change is agreed, describe it clearly and confirm which version should move forward. Keep feedback tied to that version.
5. Skipping the evaluation plan
A prototype should lead to a decision. Decide how you will inspect, assemble or test it, and record the result. If more than one team is involved, agree who makes the final review decision.
Leave space in the plan for learning. A first sample may reveal a better direction, and that is often a useful outcome rather than a failed project.
Bring this to your brief
Before making begins, confirm the purpose, dimensions, finish, revision and evaluation plan in one brief.
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