Once the sets from and into have been determined, the model goes through the
forward pass to compute the earliest time, ET [ i) . With the completion of this pass, we
can initiate the backward pass by using
let LT{n]:=ET[n];
The rest of the model is needed to obtain the output shown in Figure 6.49. This output
determines all the data needed to construct the CPM chart The logic of this segment is
based on the computations given in Examples 6.5-2 and 6.5-4.