《人机交互 human-computer interaction》PPT讲稿：chapter 9 evaluation techniques

HUMAN-COMPUTER THIRD DIX FINLAY INTERACTION EDITION ABOWD BEALE chapter 9 evaluation techniques

chapter 9 evaluation techniques

HUMAN-COMPUTER NTERACTION Evaluation Techniques Evaluation tests usability and functionality of system occurs in laboratory field and or in collaboration with users evaluates both design and implementation should be considered at all stages in the design life cycle

Evaluation Techniques • Evaluation – tests usability and functionality of system – occurs in laboratory, field and/or in collaboration with users – evaluates both design and implementation – should be considered at all stages in the design life cycle

HUMAN-COMPUTER NTERACTION Goals of evaluation assess extent of system functionality o assess effect of interface on user identify specific problems

Goals of Evaluation • assess extent of system functionality • assess effect of interface on user • identify specific problems

HUMAN-COMPUTER NTERACTION Evaluating Designs Cognitive Walkthrough Heuristic Evaluation Review-based evaluation

Evaluating Designs Cognitive Walkthrough Heuristic Evaluation Review-based evaluation

HUMAN-COMPUTER NTERACTION Cognitive Walkthrough Proposed by polson et al evaluates design on how well it supports user in learning task usually performed by expert in cognitive psychology expert walks though design to identify potential problems using psychological principles forms used to guide analysis

Cognitive Walkthrough Proposed by Polson et al. – evaluates design on how well it supports user in learning task – usually performed by expert in cognitive psychology – expert ‘walks though’ design to identify potential problems using psychological principles – forms used to guide analysis

HUMAN-COMPUTER NTERACTION Cognitive Walkthrough(ctd) For each task walkthrough considers what impact will interaction have on user? what cognitive processes are required? what learning problems may occur? Analysis focuses on goals and knowledge: does the design lead the user to generate the correct goals?

Cognitive Walkthrough (ctd) • For each task walkthrough considers – what impact will interaction have on user? – what cognitive processes are required? – what learning problems may occur? • Analysis focuses on goals and knowledge: does the design lead the user to generate the correct goals?

HUMAN-COMPUTER NTERACTION Heuristic Evaluation Proposed by nielsen and molich usability criteria(heuristics are identified design examined by experts to see if these are violated Example heuristics system behaviour is predictable system behaviour is consistent feedback is provided Heuristic evaluation debugs design

Heuristic Evaluation • Proposed by Nielsen and Molich. • usability criteria (heuristics) are identified • design examined by experts to see if these are violated • Example heuristics – system behaviour is predictable – system behaviour is consistent – feedback is provided • Heuristic evaluation `debugs' design

HUMAN-COMPUTER NTERACTION Review-based evaluation Results from the literature used to support or refute parts of design Care needed to ensure results are transferable to new design Model-based evaluation Cognitive models used to filter design options e.g. GOMS prediction of user performance Design rationale can also provide useful evaluation information

Review-based evaluation • Results from the literature used to support or refute parts of design. • Care needed to ensure results are transferable to new design. • Model-based evaluation • Cognitive models used to filter design options e.g. GOMS prediction of user performance. • Design rationale can also provide useful evaluation information

HUMAN-COMPUTER NTERACTION Evaluating through user Participation

Evaluating through user Participation

HUMAN-COMPUTER NTERACTION Laboratory studies · Advantages: specialist equipment available uninterrupted environment Disadvantages lack of context difficult to observe several users cooperating Appropriate if system location is dangerous or impractical for constrained single user systems to allow controlled manipulation of use

Laboratory studies • Advantages: – specialist equipment available – uninterrupted environment • Disadvantages: – lack of context – difficult to observe several users cooperating • Appropriate – if system location is dangerous or impractical for constrained single user systems to allow controlled manipulation of use