In CPM scheduling, what does it mean when an activity has negative float?
Correct Answer
C) The activity is behind schedule and will delay the project
Negative float indicates that an activity is behind schedule and will cause the overall project to be delayed beyond its planned completion date. This requires immediate attention to get the project back on track.
Why This Is the Correct Answer
CORRECT_ANSWER - Negative float occurs when an activity's late finish date is earlier than its early finish date, meaning the activity is taking longer than originally planned. This creates a deficit in the schedule that pushes the project completion date beyond the target date. Negative float is a red flag that requires immediate corrective action, such as crashing or fast-tracking, to bring the project back on schedule.
Why the Other Options Are Wrong
Option A: The activity can be delayed without affecting the project
While activities with negative float may be on the critical path, simply being on the critical path doesn't create negative float. Critical path activities have zero float when on schedule. Negative float specifically indicates the activity is behind schedule, not just critical.
Option B: The activity is ahead of schedule
This describes positive float, which is the opposite of negative float. Activities that can be delayed without affecting the project have slack time or positive float. Negative float means any further delay will definitely impact the project completion date.
Memory Technique
Think 'Negative = Need help!' - negative float means the project needs immediate help to get back on track, just like a negative bank balance needs immediate attention.
Reference Hint
Look up CPM scheduling and float calculations in the project management or scheduling chapter of your contractor reference manual, typically found in the project planning section.
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