You have computed the critical path and the project completion time correctly. You could have used those steps to calculate the earliest start and finish times for each task.
Let’s define the terms
Earlist Start time is the earliest expected time an activity can start. Hence, it is the maximum of the expected finish times of its predecessors, or 0 in case there are no predecessors.
Earliest Finish Time is the earliest expected time that an activity can finish. Hence, it is the expected time to finish that task, plus (the maximum of the expected time to finish its predeeding tasks, or 0 in case there is no predecessor).
I used Excel to compute the Earliest Start and Earliest End times for your problem; unfortunately I am not allowed to attach the sheet. I have copied the table.
It is apparent from the table that for tasks, A, B, and C, the Earliest Start and Earliest End are 0, and the time taken for the task, respectively, because there are no preceding tasks. For the other tasks, the earliest start time is the end time of its critical predecessor task. To get the Earliest End time, just add the expected time to get their start time.
Hope this helps.
|Task||Optimistic||Mean||Pessimistic||Predecessors||Expected time||Earliest Start Time||Earliest Finish||Critical Predecessor|
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