Comment (including rationale for any proposed change):
mechanism is available for ....
A mechanism is only useful if: it is usable by AT or b, it is usable by the user
change definition of mechanism to process or technique for achieving a result that is easy (does not require a change of context, and uses simple language) for the user to use can be programmatically determined for AT for people with learning disabilities
To clarify that the user must be able to access the mechanism, we have added the following note to the definition:
Note: the mechanism must meet all success criteria for the conformance level claimed