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CPA problem (dummies)

  1. Oct 11, 2012 #1
    This is not really a h/w question but one thing I so not understand with this precedence table in critical path analysis , why would it needs two dummies?

    Activity. | Depends On
    A | -
    B | -
    C | A
    D | B
    E | B,C
    F | B,C

    I drew this activity network and I only used 1 dummy to represent the dependence of E , F didn't need another dummy variable.

    Can anyone explain why? Hence draw an activity network to show .

  2. jcsd
  3. Oct 13, 2012 #2
    You need a dummy starting variable that connects to A and B. You also need a dummy ending variable that is connected from D, E and F.

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