Usability
Fleeting- Référence externe : https://www.nngroup.com/articles/recruiting-test-participants-for-usability-studies/
- Référence externe : https://www.nngroup.com/articles/usability-101-introduction-to-usability/
usability
Usability is a quality attribute that assesses how easy user interfaces are to use
— https://www.nngroup.com/articles/usability-101-introduction-to-usability/
defined by 5 quality components:
Learnability: How easy is it for users to accomplish basic tasks the first time they encounter the design? Efficiency: Once users have learned the design, how quickly can they perform tasks? Memorability: When users return to the design after a period of not using it, how easily can they reestablish proficiency? Errors: How many errors do users make, how severe are these errors, and how easily can they recover from the errors? Satisfaction: How pleasant is it to use the design?
— https://www.nngroup.com/articles/usability-101-introduction-to-usability/
There are many other important quality attributes. A key one is utility, which refers to the design’s functionality: Does it do what users need?
— https://www.nngroup.com/articles/usability-101-introduction-to-usability/
It matters little that something is easy if it’s not what you want
— https://www.nngroup.com/articles/usability-101-introduction-to-usability/
also no good if the system can hypothetically do what you want, but you can’t make it happen because the user interface is too difficult
— https://www.nngroup.com/articles/usability-101-introduction-to-usability/
Definition of Utility = whether it provides the features you need. Definition of Usability = how easy & pleasant these features are to use. Definition of Useful = usability + utility
— https://www.nngroup.com/articles/usability-101-introduction-to-usability/
most basic and useful is user testing, which has 3 components:
Get hold of some representative users, such as customers for an ecommerce site or employees for an intranet (in the latter case, they should work outside your department). Ask the users to perform representative tasks with the design. Observe what the users do, where they succeed, and where they have difficulties with the user interface. Shut up and let the users do the talking.
— https://www.nngroup.com/articles/usability-101-introduction-to-usability/
most projects require multiple rounds of testing and redesign to achieve acceptable user-experience quality
— https://www.nngroup.com/articles/recruiting-test-participants-for-usability-studies/
hundred times cheaper to fix usability problems discovered early in the project rather than at its end.
— https://www.nngroup.com/articles/recruiting-test-participants-for-usability-studies/
The three main rules for simplified user testing are:
Get representative users Ask them to perform representative tasks with the design Shut up and let the users do the talking
— https://www.nngroup.com/articles/recruiting-test-participants-for-usability-studies/
third rule is surprisingly difficult
— https://www.nngroup.com/articles/recruiting-test-participants-for-usability-studies/
rule #2 requires some experience to execute well
— https://www.nngroup.com/articles/recruiting-test-participants-for-usability-studies/
main obstacle to quick and frequent user testing is the difficulty of finding warm bodies that satisfy rule #1.
— https://www.nngroup.com/articles/recruiting-test-participants-for-usability-studies/
Most companies have no procedures for getting five customers to show up at specified times next Wednesday, and yet that’s what is required for a successful usability study.
— https://www.nngroup.com/articles/recruiting-test-participants-for-usability-studies/