The initial event of the network is assigned time zero and then the earliest time at which the next event in project can occur is computed by using expected duration. It is denoted by ‘TE’
This gives the earliest time at which 2nd event can occur using the same procedure the earliest time for all events can be computed. If there are more than one activities coming to a particular event then earliest time for that event is taken as the maximum of the TE values among the different activities. Thus by taking the TE value for the start event as zero, we compute the TE values for all the events in the network proceeding in the forward direction. Hence the calculation of earliest time for the different events in the network is called as ‘FORWARD PASS’.
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