1B. Project schedules Flashcards
(e.g., activity identification and sequencing)
What is “Total” Float?
The amount that a task can move without affecting the final project completion date.
What is “Free” Float?
The amount that a task can move without affecting other tasks. Specifically the next task.
Early Start (ES) starts where? And starts with which number?
ES will start in the top left corner. ES starts with the number 1 - for the first day
How is Early Finish (EF) calculated?
EF = ES + Duration – 1
The reason to subtract one is because the task start and end days are inclusive of the duration. For example, if you will be working on a task from days 1 – 5, that is a duration of 5 days, because days 1 and 5 are both included in the task duration.
How is Early Start (ES) day 2 calculated?
ES2 = EF1 + 1
Simply add one, because the next task simply starts on the day after the previous one completes.
If moving from one task to two (or more), both tasks get the same ES, that is, they both start the day after the previous task.
However, when there are two (or more) tasks that merge back into one, choose the highest LS.
Describe what steps are needed for the “Forward Pass”.
The forward pass will fill out the top portion of the task card.
The top left will be the Early Start. Either 1 if it is the first task starting on day 1, or by using the formula ES2 = EF1 +1
The top middle will be the task duration.
The Top Right will be the Early Finish (EF). This is calculated by the formula EF = ES -1
How is Late Start (LS) calculated?
LS = LF – Duration + 1
Late Start is in the bottom left box of the task card
How is Late Finish (LF) calculated?
LF2 = LS1 – 1
Once again, simply subtract one because the latest possible finish of a task without affecting the next task is simply the previous day.
If moving from one task to two (or more), both tasks get the same LF.
When two (or more) tasks merge back into one, choose the lowest LS.
How is Task Float calculated
The top box minus the bottom box of the task card. It does not matter if the left of right side is used. They should remain the same.
