Finding
Begin with what the intended person should be able to do, not with the product installed. The outcome supplies a stable endpoint for testing whether the work succeeded.
How the mechanism works
Naming the outcome separates the environment, implementation method, present-use test and continuity test. It prevents equipment presence from being mistaken for evidence of access.
Evidence boundary
A well-stated outcome does not replace consent, technical assessment, clinical assessment where required, or evidence from real use.