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Critical Path MethodBy Er.Nikil Raj…

The critical path is the path that controls project duration

CRITICAL PATH METHOD EARLY START

EARLY FINISH LATE START

LATE FINISH ES LS EF LF

DURATION FLOAT SLACK FORWARD PASS

BACKWARD PASS

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Application example

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ACTIVITIES

DURATION

PREDECESSOR

A 3 -B 11 -C 9 -D 7 AE 9 BF 5 BG 5 CH 19 CI 17 D,EJ 5 F,GK 3 I,J,H

D

ES EF

LFLS

FA

ES Early start It is the earliest time that an activity can start

EF Early finish It is the earliest time that an activity can finish

LS Late start It is the late time that an activity can start

LF Late finish It is the late time that an activity can finish

D Duration Duration of activities

F FloatThe float for an activity is the amount that its duration can slip without causing the project to be delayed

Site mobilizatio

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on

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A D IB

EI

KF

JC

GJ K

H

K

3

11

9

7

9

5

5

19

17

5

3

01 03

1311

10

12 20

2012

00

12 16

3228

16

10 14

3228

18

10 28

3719

09

21 37

3721

00

17 21

3733

16

38 40

4038

00

01 09

1810

09

04 10

2014

10

01 11

1101

00

F O R W A R D P A S S

B A C K W A R D P A S S

ES+D-1=EF

EF+1=ES of next activity

Take greater value + 1

LF-D+1=LS

LS-1=LF of next activity

Take lesser value - 1

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Lets See how to do this in Primavera

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