HUMAN-COMPUTER NTERACTION Using norman s model Some systems are harder to use than others Gulf of execution user's formulation of actions t actions allowed by the system Gulf of evaluation user's expectation of changed system state actual presentation of this state
Using Norman’s model Some systems are harder to use than others Gulf of Execution user’s formulation of actions ≠ actions allowed by the system Gulf of Evaluation user’s expectation of changed system state ≠ actual presentation of this state
HUMAN-COMPUTER NTERACTION Human error-slips and mistakes slip O understand system and goa e correct formulation of action incorrect action mistake o may not even have right goal! Fixing things? slip- better interface design mistake -better understanding of system
Human error - slips and mistakes slip understand system and goal correct formulation of action incorrect action mistake may not even have right goal! Fixing things? slip – better interface design mistake – better understanding of system
HUMAN-COMPUTER NTERACTION Abowd and Beale framework extension of Norman their interaction framework has 4 parts user output input U system core task output Input each has its own unique language interaction translation between languages problems in interaction problems in translation
Abowd and Beale framework extension of Norman… their interaction framework has 4 parts – user – input – system – output each has its own unique language interaction translation between languages problems in interaction = problems in translation S core U task O output I input
HUMAN-COMPUTER NTERACTION Using abowd Beales model user intentions translated into actions at the interface ,translated into alterations of system state >reflected in the output display interpreted by the user general framework for understanding interaction not restricted to electronic computer systems identifies all major components involved in interaction allows comparative assessment of systems an abstraction
Using Abowd & Beale’s model user intentions → translated into actions at the interface → translated into alterations of system state → reflected in the output display → interpreted by the user general framework for understanding interaction – not restricted to electronic computer systems – identifies all major components involved in interaction – allows comparative assessment of systems – an abstraction
HUMAN-COMPUTER NTERACTION ergonomIcs physical aspects of interfaces industrial interfaces
ergonomics physical aspects of interfaces industrial interfaces