Which one of the following is NOT considered for the estimation of activity duration?
- AEvaluate activities one at a time, independently of all others.
- BFor each activity, assume a normal level of manpower and or equipment.
- CIf time units of working days are being used, assume an exceptional day with maximum working hours.Correct
- DNormal weather conditions is considered for the estimation of duration of each activity.
Solution
Concept
Activity duration is estimated for normal conditions: one activity at a time, normal resources, a normal working day and normal weather.
Step-by-step solution
1. Rule 1: Estimate each activity on its own, without thinking about other activities. This is option A, and it is considered. 2. Rule 2: Assume a normal level of manpower and equipment. This is option B, and it is considered. 3. Rule 3: Assume a normal working day, not an exceptional day with maximum working hours. Option C goes against this rule. 4. Rule 4: Assume normal weather conditions. This is option D, and it is considered. 5. So option C is NOT considered.
Explanation
Duration estimates must be based on normal conditions so that the schedule is realistic. A normal working day is assumed, not an exceptional day with overtime or maximum hours. So option C is not used.
Why the other options are wrong
A, B and D are all standard rules for estimating activity duration, so they are considered.
Shortcut
In duration estimation, everything is 'normal'. Any option saying 'exceptional' or 'maximum' is the odd one out.
Common mistake
Thinking that maximum working hours should be assumed to get a shorter schedule.
Correct answer: C) If time units of working days are being used, assume an exceptional day with maximum working hours.