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Chapter 4

Chapter 4. Critical Requirements. Objective. Critical quality requirements Critical cost requirements Critical process requirements Critical safety requirements Critical delivery requirements. Critical to x (CTx) requirements.

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Chapter 4

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  1. Chapter 4 Critical Requirements

  2. Objective • Critical quality requirements • Critical cost requirements • Critical process requirements • Critical safety requirements • Critical delivery requirements

  3. Critical to x (CTx) requirements • Critical customer requirements are expressed as expectations or needs. • Process CTx’s act to quantify the critical customer requirements.

  4. Critical to Quality (CTQ) • Critical to quality (CTQ) may include the physical dimensions of height, width, depth, and weight. • CTQ’s are translated into critical requirements through customer defined specifications. • For example the customer may specify the weight of the product to be between 15 and 20 pounds. • Products outside these specifications will not meet the customer’s critical requirements.

  5. Critical to Cost (CTC) • CTCs deal exclusively with the impact of cost to the customer. • In the earlier example products heavier than 20 pounds may require more power consumption, thus increasing the cost.

  6. Critical to Process (CTP) • CTPs are typically key process input variables such as temperature, pressure, and humidity. • Once thers settings are determined they can be set to achieve a consistent process output.

  7. Critical to Safety (CTS) • CTS are customer needs for safety of the product or process. • In our earlier example product heavier than 20 pounds may cause back injuries. • Products lighter than 15 pounds may also cause back injuries because the operator picks up two at a time.

  8. Critical to Delivery (CTD) • Typically one thinks of late deliveries. • However delivering too early may be a problem to some customers because it represents excess inventory requiring early payment.

  9. Summary • Critical customer requirements are expressed as expectations or needs. • Critical to quality (CTQ) may include the physical dimensions of height, width, depth, and weight. • CTCs deal exclusively with the impact of cost to the customer. • CTPs are typically key process input variables such as temperature, pressure, and humidity. • CTS are customer needs for safety of the product or process. • Typically one thinks of late deliveries (CTDs).

  10. Home Work • 1. What do process CTx’s do to critical customer requirements? • 2. What are some critical to quality requirements? • 3. What are some critical to process (CTP) variables?

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