5 The precedence relations and crew size required to complete a project are given in Table 5.

For example, activity E, which comes after activity C, requires 10 weeks for its completion by a crew of six people.

a. Construct an early-start Gantt chart and identify the critical path.

b. Calculate and chart the labor profile required to complete the project for both an early-start and a late-start schedule.

c. Level the required labor as much as possible with the goal of completing the project within the time period specified in part (a).

TABLE 5 Immediate Time Crew Activity predecessors (weeks) size A — 4 4 B A 2 5 C A 6 3 D B 3 7 E C 10 6 F — 2 5 G D 5 6 H F 7 2 I D, E, G 1 8 J H 10 2