Summary: Create CUJs and define your primary and secondary use cases to understand how users will interact with your product. You'll use these later to test and measure for accessibility.
Creating CUJs
Before you can design, build, and test, you'll want to know how users will interact with your product and what they want to achieve.
Google defines a Critical User Journey (CUJ) as the combination of a critical goal and the journey of tasks a user undertakes to achieve that goal . As a user accomplishes each task, they get one step closer to achieving their goal. We recommend measuring your CUJs with AGUA (Assessment of Google Usability Accessibility) before launch.
CUJs are intended to achieve alignment and provide direction, which is then used to make the testing use cases.
Defining use cases
Primary and secondary use cases detail the important tasks users should be able to perform. You'll test these use cases against GAR (Google Assessment Rating) later using assistive technologies to make sure they can be completed.
Learn more about CUJs, use cases, and GAR in So you want to make some GAR use cases (go/stofe-uxr-a11y).