Precedence Diagram Method (PDM)

Question 1

Forward: ES + DU - 1 = EF

Answer 1

Forward fomula.

Early finish = Early start + Duration - 1

Question 2

Backward: LF - DU + 1 = ES

Answer 2

Backward formula.

Early start = Late Finish - Duration + 1

Question 3

Float = LS - ES or LF - EF

Answer 3

Float calculate formula.

Float = Late Start - Early Start
OR
Float = Late Finish - Early Finsih