A dummy variable is an activity inserted into the network diagram to show a precedence relationship,but does not represent any passage of time.

Name: A dummy variable is an activity inserted into the network diagram to show a precedence relationship,but does not represent any passage of time.
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A dummy variable is a placeholder activity that does not require any time to complete and is used to represent a dependency in the network diagram. It is also known as a dummy activity or a dummy node.

A Dummy Variable Is an Activity Inserted into the Network