A project schedule shows Activity X has an early start of day 15, early finish of day 22, late start of day 18, and late finish of day 25. What is the total float for this activity?
Correct Answer
D) 3 days
Total float is calculated as Late Start minus Early Start (18 - 15 = 3 days) or Late Finish minus Early Finish (25 - 22 = 3 days).
Why This Is the Correct Answer
Total float represents the amount of time an activity can be delayed without affecting the project completion date. It is calculated using either Late Start minus Early Start (18 - 15 = 3 days) or Late Finish minus Early Finish (25 - 22 = 3 days). Both calculations yield the same result of 3 days, confirming that Activity X has 3 days of scheduling flexibility before it impacts the critical path.
Why the Other Options Are Wrong
Option A: 7 days
7 days incorrectly represents the duration of the activity (Early Finish minus Early Start: 22 - 15 = 7). This is the activity duration, not the total float. Students often confuse activity duration with float calculations.
Option B: 10 days
10 days appears to be an arbitrary calculation that doesn't follow any standard float formula. This might result from incorrectly adding values or misunderstanding the relationship between early and late dates in project scheduling.
Option C: 15 days
15 days represents the Early Start date itself, not a calculated float value. This shows confusion between schedule dates and float calculations, possibly mixing up the Early Start value with the actual float computation.
Memory Technique
Remember 'LESE' - Late minus Early = Slack/float. Whether using Start dates (LS - ES) or Finish dates (LF - EF), both give the same total float value.
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