Project network diagram PDF

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Information technology summary for the year 2020 in a nutshell. it will help more students to learn different basics including computer knowledge....

Description

Project network diagram A graphical or tabular schedule The project network diagram displays the duration of activities in the project, their chronological order and logical dependencies between the activities graphically or in tabular form. Unlike the work breakdown structure (WBS), a network diagram also takes into account the chronological order of activities according to their dependencies, and not just the logical order of the project activities. Bar charts such as Gantt Charts are a special form of the network diagram. Main functions of a network diagram are: 

Determination of the total duration of the project



Representation of the logical and chronological order of activities in the project

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Risks: Where is the critical path? Where are potential bottlenecks in the project process?

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Opportunities: Where can the project process be streamlined?

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The network diagram is the foundation for the project scheduling.

In modern project management, hardly any network plans are calculated "manually" anymore. Project managers use project management software to do so. However, understanding the basics of the method enable you to better understand your own project plan.

Activity A B C D E F G H

Predecessor (s) A A B C C D, E F, G

Duration (days) 3 4 2 5 1 2 4 3

Forward pass is a technique to move forward through network diagram in determining the project duration and finding the critical path or Free Float of the project. It is used to find the EET of each event, EETS = EETp + duration. Whereas backward pass represents moving backward from the end result to calculate late

start or to find if there is any slack in the activity. It is used to find the LET of each event, LETp = LETs duration.

ACTIVITY TIMES TABLE Activity

Duration (days) 3 4 2 5 1 2 4 3

A B C D E F G H

EST = EETp 0 3 3 7 5 5 12 16

EFT = EST + d 3 7 5 12 6 7 16 19

LST = LFT - d 0 3 9 7 11 14 12 16

LFT = LETS 3 7 11 12 12 16 16 19

FLOAT = LST - EST 0 0 6 0 6 9 0 0

13

15

GANTT CHART DAY NUMBER 1

2

3

4

5

6

7

8

9

10

11

12

14

16

17

18

A B Float

C D E F

Float Float

G H

19

Exercises 1. You are required to prepare a network diagram for the following project and determine the project duration and the critical path. If the owner of the project gives a deadline of 14 months, is it possible to meet it? Activity A B C D E F G H I J K

Predecessor (s) A B B C D E F, G I, H

Duration (months) 3 2 2 4 4 7 4 2 5 6 3

2. You are required to prepare a network diagram for the following project and determine the project duration and the critical path. Also, do an analysis of the different types of resources being used by using a Gantt chart. Activity A B C D E F G

Predecessor (s) A A B B C, D F

Duration (weeks) 3 3 2 2 2 1 3

Number of Staff 5 3 4 6 2 3 5

Cost / week (Sh.) 100 200 100 300 200 100 200

3. You are required to prepare a network diagram for constructing a 5 floor apartment and also determine the earliest and latest activity times for each activity and the critical path. Activity

Description

Predecessor (s)

Duration (days)

A B C D E F G H I

Selection of site Preparation of drawings Arranging for the finance Selection of contractor Getting approval from Gov't Laying the foundation Start construction Advertise in newspaper Allocation of tenants

A A A E D, F B, C G, H

3 5 7 2 5 20 60 2 10

4. A National Conference is planned in a University. The activities are listed down along with their precedessors and time taken. Prepare a network diagram and determine the critical activities and how long the project will take to complete. Activity

Description

Predecessor (s)

Duration (days)

A B C

Confirm lead speaker and topic Prepare brochure Send letters to other speakers

B

5 1 2

D E F G H I J K

Get confirmation from speakers Send letters to participants Obtain travel plans from speakers Arrange for accommodation for speakers Get handouts from speakers Finalize registration Arrange hall and AV Conduct of programme

A, C C, D D F F E, G, H I J

Critical path: A, D, F, H, I, J, K Project duration: 28 days

5 2 2 1 4 10 1 1...