Service System Capacity

From the Ask Tom mailbag – Related to Integration is a Fancy Word. The illustrative example described an imbalance of systems in a manufacturing model, where there is a build-up of finished goods inventory (unsold).

Can you provide an example of an anemic sales function in a service industry. What would you get instead of an inflated inventory?

Thanks for the question. In a service industry, say you have 20 trucks, 20 technicians, optimized to average three service calls per day. The daily average capacity is 60 calls.

If sales only sells 55 average daily calls, you have excess unsold capacity of 5 service calls. You may not even notice. If the average drops to 50, you may begin to notice, and so do your service technicians. How long does it take a service technician to complete two assigned service calls vs three assigned service calls? The answer is 8 hours, no matter which. Parkinson’s law – work expands to the time allotted.

This is functional integration work, to monitor the capacity of each function, to make sure the impact of one function doesn’t outstrip or adversely impact the capacity of its neighboring functions.

In this service example, the math is pretty easy, 20 technicians x 3 calls = 60. Sometimes the service work has more subtle variations where the math is not so clean. That’s why system capacity makes for fascinating study.

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