Transcript Chapter 4

Chapter 4
Critical Requirements
Objective
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Critical quality requirements
Critical cost requirements
Critical process requirements
Critical safety requirements
Critical delivery requirements
Critical to x (CTx) requirements
• Critical customer requirements are expressed
as expectations or needs.
• Process CTx’s act to quantify the critical
customer requirements.
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.
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.
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.
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.
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.
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).
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?