with si the start time and di the estimated duration of activity i . If there is more
than one time lag lij between two activities i and j , only the maximum time lag
is retained. Figure 2.11 shows the project network of Fig. 2.9 after applying the
transformation rules. The bold arcs in these two figures are used to display the socalled
critical path, which will be explained in Sect. 2.3.2.