Question 143 - CPIM-Part-2 discussion

Nervousness is a term that describes the instability or variability of a production schedule due to frequent changes in demand, supply, or capacity. Nervousness can cause disruption, inefficiency, and waste in the production system, as well as lower customer service and satisfaction. Changing the due dates of open orders is a main cause of nervousness in the schedule, as it affects the priority and sequence of the production orders, and may require rescheduling or replanning of the resources and activities. Changing the due dates of open orders may be necessary to accommodate urgent or unexpected customer requests, but it also increases the complexity and uncertainty of the production process.

The other options are not the main negative effects of changing the due dates of open orders. The schedule information becomes inaccurate is not a negative effect, but a consequence of changing the due dates of open orders. The schedule information reflects the planned input/output of the production system, and it needs to be updated and communicated whenever there are changes in the due dates of open orders. The customer service level decreases is not a negative effect, but a possible outcome of changing the due dates of open orders. The customer service level measures the degree to which the production system meets or exceeds the customer expectations in terms of quality, quantity, and delivery. Changing the due dates of open orders may improve the customer service level for some customers, but it may also deteriorate it for others, depending on how the changes affect their orders. The schedule does not support demand is not a negative effect, but a potential problem of changing the due dates of open orders. The schedule should support demand by ensuring that the production system can produce or deliver what the customers want, when they want it. Changing the due dates of open orders may create a mismatch between the schedule and demand, which may result in overproduction or underproduction, stockouts or excess inventory, or late or early deliveries.Reference: CPIM Exam Content Manual Version 7.0, Domain 6: Plan, Manage, and Execute Detailed Schedules, Section 6.1: Detailed Scheduling Concepts, p. 36; Nervousness; Production Schedule.