engineering project management · 2015-03-22 · 1. work breakdown structure (wbs) wbs is a...

Pusan National University

Ph.D. Young-Min, Kyoung

Engineering Project Management

▶ Subject : Project Planning – Overview ◀

Project Management Process

2015-03-22 2

WBS (Work

Breakdown

Structure)

Network

Diagram

CPM

- Schedule

- Critical Path

- Completion

time, etc

Time

management

Risk

management

1

2

3

Choosing the project

Planning the project

Initiation Execution

Monitoring & Control

(10/22, W)

(11/17, M)

(11/10, M)

Closing the project

Deliverables Lessons learned

Today’s contents

Cost management

1. Work Breakdown Structure (WBS)

WBS

is a deliverable-oriented decomposition of a project into smaller components

can be used

to represent the structure of a product, or

to make a service plan of a project

and provides the necessary framework for the succeeding cost estimate, resource allocation, and time management, etc.

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1. Work Breakdown Structure (WBS)

Procedure

decompose the project into work elements

we call these elements or their groups as “activities”.

also called “tasks” or “work packages”

two approaches

Top-down approach

Bottom-up approach

estimate the duration of each activity

“duration” means the time required to complete an activity

determine the precedence relationship between activities

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1. Work Breakdown Structure (WBS)

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Comparison of Top-down approach and Bottom-up approach

A project

Work Elements

난방·환기·공기조절장치

(수도·가스의) 배관 공사

굴착; (기초공사의) 땅파기

철골구조물 설치

들보

벽돌 공사

1. Work Breakdown Structure (WBS)

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Camping Example(▲) : Top-Down approach

Camping Example(▶) : Bottom-Up approach

spoon

chopsticks

burner

Kocher

lantern

tent

aspirin

match

map

sleeping bag

hammer

so many others …

Camping

Group 1 Group 2 …

?

… …

Level n

Level n-1

cooking equipment

food & drink

sleeping equipment

emergency medicines

Camping

sleeping bag

mosquito killer

air pillow

Level 1

Level 2

Level 0

…

1. Work Breakdown Structure (WBS)

Representation methods of WBS

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▼ Tree type

▼ List type

1. Work Breakdown Structure (WBS)

Example of WBS

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cf. calculation of duration

◀ List typed WBS

2. Gantt Chart / Network Diagram

Gantt Chart

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start

required information :

detailed list of tasks (← WBS)

duration of each task

relationships between the tasks

finish

※ prepare a pencil, ruler and grid sheets

2. Gantt Chart / Network Diagram

Two types of Network Diagrams

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1 2 3 A B

Arrow Diagram

Activity

A

Activity

B

Event

1 Event

2 Event

3

A B

Precedence Diagram

Activity

A

Activity

B

선행관계 (precedence relationship)

AOA Diagram (Activity On Arrow)

AON Diagram (Activity On Node)

화살도형법 (ADM: Arrow Diagramming Method)

선후행관계도법 (PDM: Precedence Diagramming Method)

2. Gantt Chart / Network Diagram

Representation of Networks

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A B

A precedes B

A

B

C

B, C : independent activities A precedes B and C

C

A

B

A, B : independent activities A, B precede C

A

B

C

D

A, B : independent activities C, D : independent activities A and B precede C and D

A

B

C

E

D F

Exceptional Case

2. Gantt Chart / Network Diagram

Example

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A

B

D

C

E

F G

H

3. Critical Path Method(CPM)

Project Scheduling

EST and ECT : Forward Calculation Method

LST and LCT : Backward Calculation Method

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3

3. Critical Path Method(CPM)

EST, ECT Calculation

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A

B

D

C

E

F G

H

0 2

2 5

2 4

5 9

5 7

9 10 10 15

15 18

3. Critical Path Method(CPM)

LST, LCT Calculation

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A

B

D

C

E

F G

H

0

0

2

2

2

2

5

5

2

5

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7

5

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9

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3. Critical Path Method(CPM)

Critical Path, Critical Activities, and Project Completion Time

The project manager should have consideration on ?

Which activities are loose ?

The critical activity may change to slack activity.

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A

B

D

C

E

F G

H

0

0

2

2

2

2

5

5

2

5

4

7

5

5

9

9

5

7

7

9

9

9

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15

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