Accessibility travels through the flow

The user must be able to complete the critical task without relying on one input method or sense.
State changes must be perceivable and understandable.
Focus, reading order, labels, and recovery matter across transitions.

Quality lens

OperateCan the user reach every action?

NoticeCan the user perceive state changes?

UnderstandCan the user understand the next step?

RecoverCan the user recover without losing work?