A 4D model shows not only when things are built but who is working where, and under what. Use it to find work stacked over other work, loads lifted over people, and edges left open.
A 4D model links the programme to the model: play it and you watch the building go up. Most teams use it to check logic and progress. It's just as good for safety, because the same model shows who is working where, and what is above them, week by week.
A 4D model links model elements to programme activities, so the model can show what exists on any date. On BIMpedia, the 4D Simulator plays the programme on the model and checks the sequence (elements planned before the structure under them is finished).
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