Usability testing is used to determine how 'usable' the interface or product in question is for its intended audience. Through the use of goal-oriented questions, the designers can determine what works and what does not work by testing the interface before releasing it to the public.
The process of performing a usability test and getting feedback helps to inform the designers whether or not their interface is intuitive or confusing.
Test the interface with the audience it is intended for to get the best type of feedback regarding its ease of use.
The short answer: Continuously. Perform usability tests frequently throughout the creation process to get feedback often and make changes as you go along. What may be considered the best design from the designers point-of-view may not be the best design for the intended audience.
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Follow the instructions for the sample usability test below
Create a goal for your users:
User Goal: Locate and browse the displayed projects.
Create a list of questions for your users to respond to with the interface:
1. What platform are you using? (i.e. Mobile)
2. What do you do to get to the projects?
and so on...
Remember to ask questions that provide the opportunity for valuable feedback. Do not ask questions that can be answered with a simple "yes" or "no."
Create your own usability test with a goal and list of questions for your users. You can test the usability of already-existing projects, though it is most ideal for projects in-the-making!
Usability testing is not about how the interface looks.
Usability testing is about how the interface works.