According to the ASQ Quality Glossary, voice of the customer (VOC) is defined as, “The expressed requirements and expectations of customers relative to products or services, as documented and disseminated to the providing organization’s members.” VOC is a process for capturing customers’ requirements. It produces a detailed set of customer wants and needs which are organized into a hierarchical structure, and then prioritized in terms of relative importance and satisfaction with current alternatives. A systematic approach to translating the voice of the customer into the voice of the engineer (VOE) has been the strength of quality function deployment since its inception.