Why Use Quality Function Deployment？ In a large project with large teams from several disciplines (engineering, marketing,manufacturing,field service,etc.product definition and conception may vary from interest group to interest group. QFD makes sure everyone is viewing the product in the same way.Why Use Quality Function Deployment? In a large project with large teams from several disciplines (engineering, marketing, manufacturing, field service, etc.) product definition and conception may vary from interest group to interest group. QFD makes sure everyone is viewing the product in the same way