In the model in Example 15.4, suppose each project consists of two activities and the second…

In the model in Example 15.4, suppose each project consists of two activities and the second activity for each project cannot begin until the first activity is completed. Assuming the two activities for a given project could require different numbers of employees, how would you modify the model developed in Example 15.4? (You can make up any reasonable activity times and employee requirements.)

Example 15.4

SCHEDULING PROJECTS AT TIMBURTON

Timburton Construction has 10 projects that it can (if desired) complete within the next 10 months. Each project earns a certain revenue when it is completed, but only if it is completed within the next 10 months. Otherwise, the project earns no revenue. The number of workers needed each month, the number of months needed to complete each project, and the revenue earned from each completed project are listed in Table 15.7. We assume that after the company begins working on a project, it must work on the project during consecutive months until the project is completed. Timburton has 220 workers available each month. How can it maximize the revenue earned during the next 10 months? Objective To find starting times for the projects so that total revenue is maximized and worker utilization each month is no greater than worker availability.