用户特征（User characteristics）

Psychological and social characteristics

– Do cognitive abilities influence ease of operation?

– Do knowledge, experience and habit influence ease of operation?

– Do cultural differences influence ease of operation?

– Does literacy influence ease of operation?

– Does language influence ease of operation?

· Physical and sensory

– Are body dimensions relevant for ease of operation?

– Are strength and biomechanical abilities relevant?

– Are visual abilities relevant for ease of operation?

– Are auditory abilities relevant for the ease of operation?

– Does handedness influence the ease of operation?

· Categories

– Does age influence the ease of operation?

– Does gender influence ease of operation?