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    Hi,
    Could somebody please explain to me why the mark scheme uses a dummy from the end of D to the start of F, when I'm sure (though probably wrong) that you can avoid this?


    Pic of mark scheme network, precedence chart, and my attempt at the network ^^^^^.

    I'm probably tired and missing something really obvious, but this is driving me insane :eek3: .
    Thanks,
    DaGianni.
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    Since the question does not specify any conditions except that the network links the immediate predecessors appropriately, I can see no reason why you should not be awarded the marks. The dummy from D to F is unnecessary, as your network clearly demonstrates; with the exception of F, no activities actually depend on D or E, so why use a dummy from D? That said, they are practically the same network, as the dummy does not add to the time, it simply adds one more event point than is necessary; the critical path is the same in both networks [A->B->E->F->H].
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    Thanks
 
 
 
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