ASSUMPTIONS OF CPM/PERT
  1. A project can be sub-divided into a set of predicable, independent activities.
  2. The precedence relationships of project activities can be completely represented by a non-cyclical network graph in which each activity connects directly into its immediate successors.
  3. Activity times may be estimated either as single point estimates or as three point estimates (i.e. optimistic, pessimistic or most likely) and are independent of each other.
  4. Activity duration is assured to follow the beta distribution, the standard deviation of the distribution is assumed to be 1/6th of its range.Mean (te) is assumed to be = Mean.Variances in the length ...

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