Float (Slack) Analysis

Correct Answer: Free float allows schedule flexibility that does not delay other activities, while total float represents the maximum delay possible before impacting project completion

Total float (TF) and free float (FF) are distinct concepts in Critical Path Analysis: The correct answer explains that free float represents the amount of time an activity can be delayed when all successor activities start at their earliest times. This means using free float won't affect any other activities in the schedule. Total float, on the other hand, is the maximum amount an activity can be delayed before it affects the project completion date. Why other answers are incorrect: - Adding all possible delays is not how float is calculated, and the minimum delay concept is incorrect - Free float is not calculated by subtracting dependent activities from total float - Free float applies to all activities, not just critical path activities (which by definition have zero total float) Understanding the difference between TF and FF is crucial for schedule optimization and resource management in project planning.

Correct Answer: It indicates that the activity needs to be performed faster than planned to meet schedule constraints

Negative float in project scheduling is a critical indicator that signals a serious schedule problem. When float becomes negative, it means the scheduled completion date will exceed the required completion date, and the activity must be completed in less time than currently planned to meet project constraints. Negative float typically occurs when: - Mandatory constraints are applied to activities - Project deadlines cannot be met with current durations - There are scheduling conflicts that need resolution The other answers are incorrect because: - Slack or float time always refers to positive values when discussing delay capacity - Extra time between early and late start dates is positive float, not negative - Buffer time for resource leveling is also a positive value, not negative Negative float requires immediate management attention and usually demands schedule compression techniques like fast tracking or crashing to bring the project back on track.

Correct Answer: The total float decreases by the duration of the extension

When an activity is extended beyond its earliest completion date while maintaining the project end date, the total float will decrease by the amount of the extension. This occurs because float represents the flexibility in scheduling activities, and when you use up some of that flexibility by extending an activity, you reduce the available float. The float cannot increase during an extension because you're consuming time buffer, not creating it. The float doesn't remain constant because you're actively using the available scheduling flexibility. The float doesn't transfer equally to parallel activities because float consumption affects the specific path where the extension occurs, not all parallel paths equally. For example, if an activity has 10 days of float and you extend it by 4 days, the remaining float will be 6 days, demonstrating the direct reduction in total float.