The Critical Path Method (Antonio Prensa Pmp, Mba 2002) Diapositivas - Puerto Rico

8/9/2019 The Critical Path Method (Antonio Prensa Pmp, Mba 2002) Diapositivas - Puerto Rico

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The Critical Path MethodThe Critical Path Method

Presented byAntonio Prensa,MBA, PMP, CCP, CSTE for ProjectManagement Institute Puerto Rico

Chapter

June 20, 2002

San Juan, Puerto Rico


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"I believe that this nation shouldcommit itself to achieving a goal, before

this decade is out, of landing a man on

the moon..." - John F. Kennedy,

May 27,1961


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On July 20, 1969, just eight years after Kennedy's

speech, Apollo 11 landed two men on the moon.This achievement was possible only with careful

production planning that included the critical path

method.

NASA used the critical path method to help

determine an efficient schedule for the tasks thatled to the moon landing.


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Discussion Topics

BackgroundSome questions about the project

What is the Critical Path Method(CPM)?

Why the CPM?

How to use the CPM ?Questions and Answers


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Background

The critical path method (CPM) wasinvented by project managers in theearly 1950's.

The US Navy adapted and improved itto manage the Polaris missile project inthe late 1950's


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Some questions about the

project

How long will the entire project take tocomplete?

Which activities determine total projecttime?

Which activity times should beshortened, if possible, or in otherwords, how many resources should beallocated to each activity?


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What is the CPMCPM?

Critical Path Method (CPM), is a procedure for

using network analysis to identify those tasks whichare on the critical path: ie where any delay in thecompletion of these tasks will lengthen the projecttimescale, unless action is taken.

For all tasks off the critical path, a degree oftolerance is possible (eg. late start, late completion,early start, etc.).

Network charts and CPM analysis used to be carriedout by hand.

Software is now available which requires the useronly to enter the tasks, duration of each task anddependencies upon other tasks; a network chart andCPM is then automatically created.


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Why the CPM?

The CPMCPM formally identifies tasks whichmust be completed on time for the wholeproject to be completed on time

Identifies which tasks can be delayed for awhile if resource needs to be reallocated tocatch up on missed tasks

It helps you to identify the minimum length of

time needed to complete a projectThe CPM determines both the early start and

the late start date for each activity in the

schedule.


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How to use the CPM?

Project Network DiagramAny schematic display of the logical relationshipsAny schematic display of the logical relationships

of project activities.of project activities.

1

3

2

5 7

4 6

8


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How to use the CPM?

List the activitiesAnd relationships

List the activitiesAnd relationships

Create a startnode

Create a startnode

Draw arrows fromStart node to the

First activitys node

Draw arrows fromStart node to the

First activitys node

Sequentially

Arrange allActivities fromStart

Sequentially

Arrange allActivities from

Start

Repeat process

from successorsfor all activities

Repeat process

from successorsfor all activities

Double check for

missedrelationships

Double check for

missedrelationships


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How to use the CPM?

EarlyStart (ES)

Late

Start (LS)

Early Finish(EF)

Late

Finish (LF)

Task duration


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How to use the CPM?

Task ID Duration Dependency

A 7

B 3

C 6 A

D 3 BE 3 D,F

F 2 B

G 3 C

H 2 E,G


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How to use the CPM?

FS

A

B

C G

H

D

F

E

(7) (6) (3)

(3) (3)

(2)

(3)

(2)

0

0

77 13 16

16 18

3 3 6

3 5

6 9

13


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How to use the CPM?

FS

A

B

C G

H

D

F

E

(7) (6) (3)

(3) (3)

(2)

(3)

(2)

0

0

77 13 16

16 18

3 3 6

3 5

6 9

1816

16

16

13

13

13

13

770

13

13

10

11

107


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How to use the CPM?

FS

A

B

C G

H

D

F

E

(7) (6) (3)

(3) (3)

(2)

(3)

(2)

0

0

77 13 16

16 18

3 3 6

3 5

6 9

1816

16

16

13

13

13

13

770

13

13

10

11

107

000

0

77

8

7


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Summary

Critical Path Analysis is an effective andpowerful method of assessing:

Tasks which must be carried out

Where parallel activity can be carried outThe shortest time in which a project can becompleted

Resources needed to achieve a projectThe sequence of activities, scheduling, andtimings involved

Task priorities


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Do you need more

information?

Project Management:A systems approach toPlanning, Scheduling, and Controlling Harold Kerzner, Six edition.

Project Management: A Managerial Approach Jack R. Meredith, Samuel J. Mantel, FourthEdition.

Web Search Engine key word: The CriticalPath Method or The CPM.


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Contact me at:

Antonio Prensa Email: [email protected] /

[email protected]

Phone: (787) 751-9800 ext. 3725


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The Critical Path MethodThe Critical Path Method

Presented byAntonio Prensa,MBA, PMP, CCP, CSTE forProject Management Institute

Puerto Rico Chapter

June 20, 2002

San Juan, Puerto Rico

Documents

The Critical Path Method (Antonio Prensa Pmp, Mba 2002) Diapositivas - Puerto Rico