<https://opexlearning.com/resources/voice-of-the-customer-what-they-really-think-of-you/20294/#primaryimage>
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"voice of the customer, customer service, service, lean six sigma, six sigma, shmula.com"
<https://opexlearning.com/resources/voice-of-the-customer-what-they-really-think-of-you/20294/>