What is Usability?
To consider a product Usable, it needs to be Useful, Efficient, Effective, Satisfying, Learnable, and Accessible.
Usefulness - The degree to which a product enables users to achieve their goals.
Efficiency - The quickness with which users can accomplish their goals or tasks.
Effectiveness - The product behaves as users expect it to, with ease and for their intended purpose.
Learnability - is a part of effectiveness. The user should be able to use to operate the system after some prearranged amount and period of training . It also refers to the ability to relearn the system after a period of inactivity.
Satisfaction refers to the user's perceptions, feelings and opinions of the product. The users are most likely to perform well on a product that meets their needs and provides satisfaction than one that does not.
Accessibility - Accessibility and usability are related. A product that is usable for people with disabilities almost always benefits people who don't have any disabilities. Considering Accessibility can clarify and simplify the design.
Usability means everyone using the product can do it easily and quickly to accomplish their own tasks/goals.
The definition rests on the following points:
- Focusing on Users.
- People use products to be productive
- Users are busy trying to achieve tasks.
- Users conclude when a product is easy to use.
