HUMAN-COMPUTER NTERACTION Field Studies · Advantages: natural environment context retained ( though observation may alter it) longitudinal studies possible · DIsadvantages distractions noise Appropriate where context is crucial for longitudinal studies
Field Studies • Advantages: – natural environment – context retained (though observation may alter it) – longitudinal studies possible • Disadvantages: – distractions – noise • Appropriate – where context is crucial for longitudinal studies
HUMAN-COMPUTER NTERACTION Evaluating implementations Requires an artefact simulation, prototype, full implementation
Evaluating Implementations Requires an artefact: simulation, prototype, full implementation
HUMAN-COMPUTER NTERACTION Experimental evaluation controlled evaluation of specific aspects of interactive behaviour evaluator chooses hypothesis to be tested a number of experimental conditions are considered which differ only in the value of some controlled variable changes in behavioural measure are attributed to different conditions
Experimental evaluation • controlled evaluation of specific aspects of interactive behaviour • evaluator chooses hypothesis to be tested • a number of experimental conditions are considered which differ only in the value of some controlled variable. • changes in behavioural measure are attributed to different conditions
HUMAN-COMPUTER NTERACTION Experimental factors · Subjects who- representative sufficient sample Variables things to modify and measure Hypothesis what you d like to show · Experimental design how you are going to do it
Experimental factors • Subjects – who – representative, sufficient sample • Variables – things to modify and measure • Hypothesis – what you’d like to show • Experimental design – how you are going to do it