in making precise finger movements will necessitate enlarged
keypads with rests, key-guards or delayed activation. Selection
of key operating pressure may be critical to the avoidance
of muscular spasm. Both audible and displayed key feedback
will be necessary to confirm correct actuation and avoidance
of unwanted repeats. Speech-input keying may be desirable,
but some conditions giving rise to hand tremor also cause
hesitancy in speech.