Rules FOR Constructing A 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....

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RULES FOR CONSTRUCTING A NETWORK DIAGRAM 1. The direction of arrows should flow from left to right avoiding mixing of direction. No looping! 2. No single activity can be represented more than once in a network diagram. The length of an arrow has no significance. 3. The event numbered 1 is the start event and an event with highest number is the end event. Before an activity can be undertaken, all activities preceding it must be completed. That is, the activities must follow a logical sequence (or interrelationship) between activities. 4. In assigning numbers to events, there should not be any duplication of event numbers in a network diagram 5. Dummy activities must be used only if it is necessary to reduce the complexity of a network diagram 6. A network diagram must have one start and one end event.

Procedure for numbering the events Step1; Number the start or initial event as 1. Step 2: From event 1, strike out all outgoing activities. This would have made one or more events as initial events (event which do not have incoming activities). Number that event as 2. Step 3: Repeat step 2 for event 2, event 3 and till the end event. The end event must have the highest number. Example 1 Draw a network diagram for a house construction project. The sequence of activities with their predecessors for the house project are as given below: Name of activity A

Description of activity Prepare the house plan

Predecessor -

Time duration (days) 4

B

Construct the house

A

58

C

Fix the door/windows

B

2

D

Wiring the house

B

2

E

Paint the house

C

1

F

Polish the doors /

D

1

windows

Example 2

1

Draw a network diagram for a building construction project. The sequence of activities with their predecessors for the building construction project are as given below: Name of activity A

Description of activity Purchase of land

Predecessor -

Time duration (weeks) 2

B

Preparation of building plan

-

3

C

Level or clean the land

A

1

D

Register and get approval

A, B

1

E

Construct the building

C

6

F

Paint the building

D

1

Example 3 Construct a network diagram for a project whose activities and their predecessor relationships are shown below. Activity Predecesso

A -

B -

C -

D A

E B

F B

G C

H D

I E

J H, I

K F, G

r Time

2

4

3

2

6

2

1

3

2

2

3

(months)

Example 4 Construct a network diagram for a project whose activities and their predecessor relationships are shown below. Activity Predecesso

A -

B A

C B

D A

E D

F C, E

G D

H D

I H

J H

K F, H

L G, J

r Time

5

4

3

2

2

2

1

3

2

3

5

2

(months)

2...