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ITEC 3230 (10)


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Information Technology
ITEC 3230
Sotirios Liaskos

INTERACTION D ESIGN 1 Evaluation: Usability Testing and Field Studies U SABILITYT ESTING Involves recording performance of typical users doing typical tasks. Controlled environmental settings. Users are observed and timed. Data is recorded on video & key presses are logged. The data is used to calculate performance times, and to identify & explain errors. User satisfaction is evaluated using questionnaires & interviews. Field observations may be used to provide 2 contextual understanding. U SABILITYTESTING C HARACTERISTICS Goals & questions focus on how well users perform tasks with the product. Comparison of products or prototypes common. Focus is on time to complete task & number & type of errors. Data collected by video & interaction logging. User satisfaction questionnaires & interviews provide data about users’ opinions. 3 EXPERIMENTS AND USABILITY TESTING Experiments test hypotheses to discover new knowledge by investigating the relationship between two or more things – i.e., variables. Usability testing is applied experimentation. Developers check that the system is usable by the intended user population for their tasks. Experiments may also be done in usability testing. 4 U SABILITY TESTING VS . RESEARCH Usability testing Experiments for research  Improve products  Discover knowledge  Few participants  Many participants  Results inform design  Results validated  Usually not completely statistically replicable  Must be replicable  Conditions controlled as Strongly controlled much as possible conditions  Procedure planned  Experimental design  Results reported to  Scientific reported 5o developers scientific community USABILITY LAB WITH OBSERVERS WATCHING A USER& ASSISTANT 6 PORTABLE EQUIPMENT FOR USE IN THE FIELD 7 8 TESTING CONDITIONS  Usability lab or other controlled space.  Emphasis on:  selecting representative users;  developing representative tasks.  5-10 users typically selected.  Tasks usually last no more than 30 minutes.  The test conditions should be the same for every participant.  Informed consent form explains 9 procedures and deals with ethical issues. SOME TYPE OF DATA  Time to complete a task.  Time to complete a task after a specified time away from the product.  Number and type of errors per task.  Number of errors per unit of time.  Number of navigations to online help or manuals.  Number of users making a particular error.  Number of users co
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