When a set of jobs must pass through two workstations whose sequence is fixed, Johnson's rule is the sequencing rule most commonly applied.
Johnson's rule is a way of scheduling jobs in two work centers in operations research. Its primary goal is to discover the best sequence of jobs to minimise makespan. It also cuts down on idle time between the two work locations. In the case of two work centers, the approach minimizes the makespan. Johnson's Rule is applicable to job sequencing through two work centers. It stipulates that the task with the longest processing time for the first process should be completed first, followed by the work with the longest processing time for the second process.
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