Question

Draw the schedule network diagram using Precedence Diagramming Method (PDM) and calculate Earliest Start (ES), Earliest Finish (EF), Latest Start (LS), and Latest Finish (LF) for each activity.

Activity	Predecessor	Duration
A		2
B		3
C		3
D	A	3
E	D	3
F	E	4
G	F	3
H	F	5
I	G, H	6
J	G	3
K	H	4
L	I, K	4
M	J	2

Answer 1

Based on the given data, we prepare AON diagram using Precedence Diagramming Method (PDM) as shown below

The above network diagram in the form of formulas is shown below for better understanding and reference:

The above project diagram is prepared as per the legend shown in the top-left corner.

EST = Early start time

LST = Late start time

EFT = Early finish time

LFT = Late finish time

SLK = Slack = LST - EST or Slack = LFT - EFT

The EST of an activity = EFT of previous activity

EFT of an activity = EST + Duration - 1

Similarly, LFT & LST are calculated during the backward pass. The activity END is only a dummy activity that is introduced for backward pass calculations only. It will not be considered for any other purpose.

Earliest Start (ES), Earliest Finish (EF), Latest Start (LS), and Latest Finish (LF) for each activity is shown in each activity box as pe legend.

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