1) What is meant by the term \"slack\" as applied to a particular activity? What

Question

1) What is meant by the term "slack" as applied to a particular activity? What is the difference between positive and negative slack? How is it calculated? 2) Which of the following is not a measure of dispersion, or spread, of a distribution: variance, mean, or standard deviation? 3) The earliest expected finish time for a project is 138 days, and its required completion time is 130 days, What is the probability of completing the project before its required time if the standard deviation of the total distribution of the activities on the longest path is 6?

Explanation / Answer

1) In project management, slack refers to the amount of time an activity in a project can be delayed without causing delaying in a subsequent activity or the project completetion time.

Slack and positive slack means the same thing. Negative slack refers to the additional time beyond the scheduled completion time of a project which an activity required to be completed.

The slack of an acctivity cal be calculated by calculating the difference between the latest start (LS) and earlisest start (ES) time of an activity. Alternatively, a slack can be calculated by calculating the difference between the latest finish (LF) time and the earliest finishing time (EF) of an activity.

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