A Kano diagram, also known as a Kano model, is a visual tool used to analyze and prioritize customer needs and expectations. It was developed by Japanese researcher Noriaki Kano in the 1980s and has since been widely used in product development and customer satisfaction studies. The diagram consists of two axes, one representing the level of customer satisfaction and the other representing the presence or absence of a particular product feature. By plotting different customer needs and features on the diagram, businesses can identify which features are essential, attractive, or indifferent to their customers. This allows them to focus their resources on developing and improving features that will have the greatest impact on customer satisfaction and loyalty. The Kano diagram is a valuable tool for businesses looking to understand and meet the ever-changing needs and expectations of their customers.