I had purchased your Formula Study Guide. For Free Float Calculation is had

Free Float = Earliest ES of Following Activities - ES of Present Activity - Duration of Present Activity

I had several questions:

1) Formula

I noticed sometimes the formula would be listed as

Free Float = ES of next activity - EF

It seems this is slighly different? Why would this be different?

2) Formula based on PERT method

Would the Free Float formula differ base don the PERT method? For example PERT with the First day being "Day 0" or " Day 1".

Since you use Day 1 as the first day, you would use your formula, however the same answer would apply if using the alternative formula if the First Day is "Day 0".

If not, please clarify.

3) Free Float vs Total Float

Would it be true to say, the formula for Total Float calculation would not change if you use First Day "Day 0" or "Day 1"?

Thank you for the clarification.