Prototype can be in the form of:
Usability is an attribute that determines a product’s ease of use. Jakob Nielson defines usability by five quality components which are:
✍️ Learnability: How easy is it for users to accomplish basic tasks for the first time.
✍️ Efficiency: Once the user have learned the design/flow, how quickly they can perform tasks?
✍️ Memorability: When users return to the design after a period of time, how easy for them to re establish efficiency.
✍️ Errors: How many errors do users make, how severe are these errors and how easily can they recover from the error.
✍️ Satisfaction: How good is it to use the design.