In CPM scheduling, what is the definition of 'early start' for an activity?
Correct Answer
C) The earliest time an activity can start based on its predecessors
Early start is the earliest possible time an activity can begin, based on the completion of all its predecessor activities. It's calculated during the forward pass of CPM scheduling.
Why This Is the Correct Answer
Early start (ES) in CPM scheduling represents the earliest possible time an activity can begin, which is determined by when all of its predecessor activities are completed. This is calculated during the forward pass through the network, where each activity's early start equals the latest early finish of all its predecessors. It establishes the theoretical minimum start time based on logical dependencies and constraints in the project schedule.
Why the Other Options Are Wrong
Option A: The latest time an activity can start without delaying the project
This describes 'late start' (LS), not early start. Late start is the latest time an activity can begin without delaying the overall project completion date. It's calculated during the backward pass of CPM scheduling and represents the maximum allowable start time while maintaining the critical path.
Option B: The scheduled start time for an activity
Scheduled start time refers to the planned or baseline start date assigned to an activity, which may differ from the early start. The scheduled start is a management decision that considers resources, constraints, and project strategy, while early start is a mathematical calculation based purely on predecessor relationships.
Option D: The actual start time of an activity
Actual start time is the real date when work on an activity actually began during project execution. This is historical data used for tracking and control purposes, not a calculated value from CPM analysis like early start, which is determined during project planning.
Memory Technique
Remember 'EARLY = EARLIEST possible' - Early Start is the EARLIEST time you CAN start based on when predecessors finish. Think 'E for Earliest, E for Everything before must be done.'
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