Customer assessment, often also called Voice of the Customer (VOC) is the expectations, experience and customers impressions of a product or company. It is an information technology in marketing that allows the customer to describe their experience with the product and expectations of it. Feedback is very important in the product development department, mainly to meet expectations and adapt the product to customer requirements. VOC consists primarily of sales, marketing and product development. Customer feedback helps manufacturers understand the needs and wishes of customers.