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D1 - Activity networks and dummies???

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    • Thread Starter

    I've been doing a few papers and keep losing marks on critical path analysis. There's often dummies in weird places and I can't work out why, and it's been on more than one paper.

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    That's just one example, but I've seen almost the exact same thing in at least one other paper. It's the part where it goes

    D -> node -> dummy

    I don't understand why a dummy is needed here. Why can't activity D just go straight to the node ending at E?
    • Thread Starter

    Exam is tomorrow so would really appreciate any help!!

    Activity D and E are required for F to happen, however D can start at time 0, so you dummy it in as it does not require A and B to be complete before doing activity D.
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