Table J.17
A company must take on seven new projects. Each project has a planning stage and a design stage, and the planning stage must be completed before the design stage can begin. Also, two project teams are available to work on these projects: Team 1 works only on planning stages of projects, and Team 2 works only on design stages of projects. The times to complete the project stage, in days, are shown in the following table.

-Using the information in Table J.17 and Johnson's rule, develop a schedule that minimizes makespan for these seven jobs. Assume that job C could be neatly split into two equal parts, each having half of the processing time on each machine as the full job C. Using your original sequence, but splitting job C, what is the reduction in makespan for the seven jobs?
A) The schedule with job C split is almost a day longer.
B) The schedule with job C split is almost 2 days shorter.
C) The schedule with job C split is almost 2 days longer.
D) There is no difference between the makespan for the original schedule and that made with job C split into two halves.

Question

Table J.17
A company must take on seven new projects. Each project has a planning stage and a design stage, and the planning stage must be completed before the design stage can begin. Also, two project teams are available to work on these projects: Team 1 works only on planning stages of projects, and Team 2 works only on design stages of projects. The times to complete the project stage, in days, are shown in the following table.
 
-Using the information in Table J.17 and Johnson's rule, develop a schedule that minimizes makespan for these seven jobs. Assume that job C could be neatly split into two equal parts, each having half of the processing time on each machine as the full job C. Using your original sequence, but splitting job C, what is the reduction in makespan for the seven jobs?
A) The schedule with job C split is almost a day longer. 
B) The schedule with job C split is almost 2 days shorter. 
C) The schedule with job C split is almost 2 days longer. 
D) There is no difference between the makespan for the original schedule and that made with job C split into two halves.

Quizplus · Accepted Answer

Johnson's rule suggests that the best sequence for these seven projects is CBGAFED, which results in a makespan of 98 days. 
However, if we split job C into two equal parts, the new sequence becomes CBGAFCED, with a reduced makespan of 96 days. Therefore, the answer is B, the schedule with job C split is almost 2 days shorter.

Table J.17 A Company Must Take on Seven New Projects. Each Project