What is Dummy activity? Explain its use in network Analysis.(Apr 2002)

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A Dummy activity is an imaginary activity. It does not exist in the Project activities. It is used in the network diagram to show dependency relationship or connectivity between two or more activities. It is represented by a dotted arrow.

 

Say in a network following is the dependency relationship-

Activity           Preceding Activity

D                                 B

E                                  B, C

 

Activity D follows activity B. Activity E follows both the activities B & C. Hence, for drawing E, we need to show a connection between B & C. Hence, from B we will draw a Dummy activity on C.

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