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).

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TABLE 5 Activity A B C D E F G H I J Immediate predecessors A A B C D F D, E, G H Time (weeks) 4 2 6 3 10 2 5 7 1 10 Crew size 45376 SONO N 5 6 2 8 2