Which one of the statements concerning sequencing rules is INCORRECT?

Question

BlackTom AI · Accepted Answer

Let’s break down each statement about sequencing rules and evaluate its accuracy based on common operations management principles.
Option 1: 'Earliest due date rule tends to minimize lateness.' This is a well-known result in scheduling theory: EDD minimizes maximum lateness for a set of jobs when all jobs are available at the same time. The reasoning is that by prioritizing tasks with the earliest due dates, you reduce the risk of large late penalties, which supports this option as true.
Option 2: 'First come first serve rule is perceived to be fair by customers.' FCFS is often viewed as fair because it processes jobs in the order they arrive, avoiding preferential treatment. In many service environments, this perceived fairness is a central justification for using FCFS, so this statement is typically considered true.
Option 3: 'Shortest processing time rule gets long jobs done as early as possible.' This statement describes the opposite of what SPT does. SPT prioritizes the shortest jobs first in order to reduce average waiting and completion times, not to accelerate long jobs. Therefore, this option is incorrect because it mischaracterizes the effect of SPT.
Option 4: 'Shortest processing time rule tends to minimize flow time in the system.' Flow time (or turnaround time) is the total time a job spends in the system from arrival to completion. SPT is known to minimize average flow time, as shorter jobs are completed quickly, reducing the average time jobs spend in the system. Thus, this statement is true.
Option 5: 'No one sequencing rule excels on all criteria.' In practice, different rules optimize differentperformance metrics (lateness, flow time, fairness, etc.), and no single rule is best for every criterion. This is a common, accurate caution in scheduling theory, so this statement is true.
Taken together, only option 3 contains a fundamental misstatement about what the Shortest Processing Time rule accomplishes, while the other statements align with established results. The incorrect characterization in option 3 explains why this option stands out as false compared to the others.

Which one of the statements concerning sequencing rules is INCORRECT?

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