In a Precedence Diagram Method (PDM) network, a 'Start-to-Start (SS) with lag of 3 days' relationship between activities A and B means:
Choose the correct answer
B can start only after A is fully complete
B can start 3 days after A has started — partial overlap is allowed
A must finish 3 days before B can finish
A and B must start simultaneously with no lag between them
Correct Answer
B. B can start 3 days after A has started — partial overlap is allowed
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PDM has four dependency types: FS (Finish-to-Start), SS (Start-to-Start), FF (Finish-to-Finish), SF (Start-to-Finish). SS+3 means B's start is constrained to be ≥ A's start + 3 days. This allows overlapping (fast-tracking) while ensuring B doesn't begin until A is 3 days into execution — critical for concurrent engineering and construction acceleration.
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