APICS Exam CPIM-Part-2 Topic 1 Question 1 Discussion

The change in level of work-in-process (WIP) inventory is the most appropriate indicator to evaluate the effectiveness of the detailed capacity planning processes for a firm that produces a moderate variety of products to stock in a single plant.Detailed capacity planning is the process of determining the quantity and timing of resources, such as labor, equipment, and materials, needed to execute the master production schedule (MPS) at the work center level1.The MPS is a plan that specifies the quantity and timing of end items to be produced in a given time period2.The change in level of WIP inventory is a measure of the difference between the amount of WIP inventory at the beginning and at the end of a period3. WIP inventory consists of partially completed products or components that are waiting for further processing or assembly.

The change in level of WIP inventory can indicate how well the detailed capacity planning processes are aligned with the MPS and the actual demand. A positive change in WIP inventory means that more products or components are being produced than consumed, which implies that there is excess capacity or insufficient demand. A negative change in WIP inventory means that more products or components are being consumed than produced, which implies that there is insufficient capacity or excess demand. A zero or minimal change in WIP inventory means that the production and consumption rates are balanced, which implies that there is optimal capacity and demand. Therefore, by monitoring the change in level of WIP inventory, the firm can evaluate whether its detailed capacity planning processes are effective in meeting customer needs and expectations, as well as minimizing inventory costs and maximizing resource utilization.

The other options are not as appropriate indicators to evaluate the effectiveness of the detailed capacity planning processes for a firm that produces a moderate variety of products to stock in a single plant. Units of output per direct labor hour is a measure of labor productivity, which indicates how efficiently labor is used to produce output. However, labor productivity does not reflect the effectiveness of detailed capacity planning processes, because it does not account for other factors that affect production, such as equipment, materials, quality, or demand. Percentage of master schedule attained is a measure of schedule performance, which indicates how well the actual production matches the planned production. However, schedule performance does not reflect the effectiveness of detailed capacity planning processes, because it does not account for other factors that affect production, such as capacity constraints, resource availability, or customer satisfaction. Level of finished goods inventory is a measure of inventory management, which indicates how much inventory is available to meet customer orders. However, finished goods inventory does not reflect the effectiveness of detailed capacity planning processes, because it does not account for other factors that affect production, such as product variety, lead time, or quality.