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.” 

Many organizations make a mistake when trying to replace their design process with Design for Six Sigma. DFSS was never intended to completely replace an organization’s existing design process. 

When examining a project from a supplier-input-process-output-customer point of view, suppliers of a customer focus on what they do in a process.