What is the free float of activity G?

What is the free float of activity G?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: (A)

Free float is the amount of time you can delay an activity without delaying the start of any activity that follows it. To find it, you look at the finish time of the activity (EF = ES plus its duration) and the earliest start times of all its immediate successors. The smallest of those successor start times limits how long you can push this activity without pushing anything downstream. So the formula is FF = (minimum ES of successors) minus (EF of the activity). For activity G, you compare its finish time to the earliest start time among the activities that depend on it. If the smallest successor ES occurs two time units after G finishes, then FF for G is 2. That means G can be delayed by two units without delaying any successor. If you plug in the actual forward-pass data from the network and get 2, that’s why the free float of G is two.

Free float is the amount of time you can delay an activity without delaying the start of any activity that follows it. To find it, you look at the finish time of the activity (EF = ES plus its duration) and the earliest start times of all its immediate successors. The smallest of those successor start times limits how long you can push this activity without pushing anything downstream. So the formula is FF = (minimum ES of successors) minus (EF of the activity).

For activity G, you compare its finish time to the earliest start time among the activities that depend on it. If the smallest successor ES occurs two time units after G finishes, then FF for G is 2. That means G can be delayed by two units without delaying any successor. If you plug in the actual forward-pass data from the network and get 2, that’s why the free float of G is two.