A group of six jobs is to be processed through a two-machine flow shop. The first operation involves cleaning and the second involves painting. Determine a sequence that will minimize the total completion time for this group of jobs. Processing times are as follows:
PROCESSING TIME (hours) | ||
Job | Work Center 1 | Work Center 2 |
A | 5 | 5 |
B | 4 | 4 |
C | 8 | 9 |
D | 2 | 7 |
E | 6 | 8 |
F | 12 | 15 |
To employ Johnson’s rule, create a “blank” sequence first, such as: