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Explain the need for the dummy activity in the Activity Network

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Find your uni forum to get talking to other applicants, existing students and your future course-mates 27-07-2015
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    Why is the Dummy Activity leading from activity D necessary ? Could it not be removed and have D join directly to that node as D and B would not be starting from the same place and finishing in the same place ? Or am I missing a rule ?
    Click image for larger version. 

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    (Original post by Mulvibusiness)
    Why is the Dummy Activity leading from activity D necessary ? Could it not be removed and have D join directly to that node as D and B would not be starting from the same place and finishing in the same place ? Or am I missing a rule ?
    Click image for larger version. 

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    What do you mean by the Dummy Activity? Are you talking about Activity A?
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    (Original post by magdaplaysbass)
    What do you mean by the Dummy Activity? Are you talking about Activity A?
    No, after activity D there is another dashed line leading from the end of activity D to the beginning of activity E and I'm wondering why that dashed line from the end of activity D to the beginning of activity E has to be there
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    This line is the dummy activity that I need someone to clarify Click image for larger version. 

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    (Original post by Mulvibusiness)
    No, after activity D there is another dashed line leading from the end of activity D to the beginning of activity E and I'm wondering why that dashed line from the end of activity D to the beginning of activity E has to be there
    The reason for the dashed line is that D is not part of the critical path. The latest finishing time for D is 30 weeks and the duration of D is only 4 weeks, so there is room for activity D to 'float.'
    D cannot be directly joined to B because the table tells you that activity B only follows activity A.
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    Oh Okay thank you for the clarification
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    (Original post by Mulvibusiness)
    Oh Okay thank you for the clarification
    no problem

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