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Explain the need for the dummy activity in the Activity Network

1. 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 ?
I Apologise for the need to enlarge
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 ?
I Apologise for the need to enlarge
What do you mean by the Dummy Activity? Are you talking about Activity A?
3. (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
4. This line is the dummy activity that I need someone to clarify
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.
6. Oh Okay thank you for the clarification
Oh Okay thank you for the clarification
no problem

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