CTQ (Critical to quality)

Tagucci said “If you cannot measure a customer requirement, you will not know if you`ve improve it”.
Starting from this affirmation we have to think how to transform the customer's voice into a measurable indicator. CTQs are the key measurable characteristics of a product or process whose performance standards or specification limits must be met in order to satisfy the customer.
Typically, a CTQ must be interpreted from a qualitative customer statement to an actionable, quantitative business specification.