Project Management, 2nd Edition

Quick Reference Formulas for Project Management

PERT time: $t_{e} = \frac{a + 4 m + b}{6}$
PERT time variance: $s^{2} = \frac{{(b - a)}^{2}}{36}$
Earliest start (ES) time for Activity i: $ES (i) = \underset{j \in P {i}}{Max} {EC (j)}$
Earliest completion (EC) time of Activity i: EC(i) = ES(i) + t_i
Earliest completion time of a project: EC(Project) = EC(n), n is the last node.
Latest completion (LC) time of a project: LC(Project) = EC(Project), with no deadline
Latest completion (LC) time of a project: LC(Project) = T_p (deadline)
Latest completion (LC) time for activity i: $LC (i) = \underset{j \in S {i}}{Min} {LS (j)}$
Latest start time for activity i: LS(i) = LC(i) − t_i
Total Slack (TS): TS(i) = LC(i) − EC(i); TS(i) = LS(i) − ES(i)
Free Slack (FS): $FS (i) = \underset{j \in S (i)}{Min} {ES (j$

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