Dependency (project management)

From Academic Kids

In a project network, a dependency is a link amongst a project's terminal elements.

There are four kinds of dependencies with respect to ordering terminal elements (in order of decreasing frequency of use):

  1. Finish to start (FS)
    • A FS B = B doesn't start before A is finished
    • image:Dependency-FS.png
    • (Foundations dug) FS (Concrete poured)
  2. Finish to finish (FF)
    • A FF B = B doesn't finish before A is finished
    • image:Dependency-FF.png
    • (Entire book written) FF (Last chapter written)
  3. Start to finish (SF)
    • A SF B = B doesn't finish before A starts
    • image:Dependency-SF.png
    • (New shift started) SF (Previous shift finished)
  4. Start to start (SS).
    • A SS B = B doesn't start before A starts
    • Missing image
      Dependency-SS.png
      image:Dependency-SS.png

    • (Project work started) SS (Project management activities started)

There are three kinds of dependencies with respect to the reason for the existence of dependency:

  1. Causal (logical)
    • It is impossible to edit a text before it is written
    • It is illogical to pour concrete before you dig the foundations
  2. Resource constraints
    • It is logically possible to paint four walls in a room simultaneously but there is only one painter
  3. Discretionary
    • I want to paint the living room before painting the dining room, although I could do it the other way round, too

Traditional critical path-derived schedules are based only on causal (logical) dependencies. The critical chain method necessitates taking into account resource constraint-derived dependencies as well.

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