Designers lose weeks modelling detail nobody asked for, and miss the few properties everyone needs. Start from who uses each element, for what, and when.
A design model is built to answer questions: does it fit, does it work, does it meet the brief? Then it meets other people, each with their own questions: the fire engineer, the estimator, the contractor's planner, the facilities team. Modelling "everything in detail" doesn't answer them; modelling the information each of them needs does.
For every element type and milestone, the level of information need answers four questions:
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