Critical to Safety requirements are based on the safety of customers. This includes safety standards & workplace health and safety rules.
Critical to Delivery requirements revolve around delivering a product successfully to a customer. When a customer makes an order, there are several expectations they might have around the delivery of it:
Critical to Cost requirements relate to a customer’s needs around the cost of your product, including factors like shipping and taxes.
Critical to X requirements are elements of a project that are important to the customer. Six Sigma projects aim to improve these elements.
The Kano model is a framework designed to prioritize features based on the degree to which they will satisfy or delighted the users.