d)  Latest start Time: The latest start time is the time by which an activity must start such that completion of project is not delayed. The latest start time of an activity between events   i and j is latest finish time minus activity duration.

                              LST = LFT – activity duration

Float:

In the last reading we have discuss that in the project with art interested in time available to execute particular task(activity) during the project period. We shall introduce the concept float which tells us how much an activity can fluctuate without affecting the completion of a project. We shall introduce following float

a)       Total float.

b)       Free float.

c)       Independent float.

d)       Interfering float.

a)       Total float is the maximum time available during which an activity can fluctuate. It is maximum time available minus activity duration. The maximum time available in the difference between latest finish time minus earliest start time.        Maximum time available to execute the work = LFT – EST