Investigation
I know what I need to do, but I can't reliably perform the action.
Separate understanding from physical performance. Record what the interface requires before deciding whether the problem is precision, movement, timing, input method or something else.
Who this is for
This investigation can be used by designers, developers, testers, product teams or anyone examining an interaction barrier.
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Where to investigate next
Evidence Ledger
Useful next steps
Finding candidates
One interaction can expose several physical demands. Test and report them separately where useful.