USABILITY CS 4323 0910 1 YFA Tersedia online

USABILITY CS 4323 / 0910 -1 YFA Tersedia online di http: //www. ittelkom. ac. id/staf/yanuar 10 YFA CS 4323 S 1/IT/IR/E 3/1209 Institut Teknologi Telkom http: //www. ittelkom. ac. id/staf/yanuar

N-Tier Model Focus of this lecture User Interface Web page Business Logic Search engine Data Index file, data files N-Tier model http: //www. ittelkom. ac. id/staf/yanuar

Non-functional Requirements Performance, Reliability, Scalability, Security… • Example: Response time (Nielsen, 1994) 0. 1 sec – the user feels that the system is reacting instantaneously 1 sec – the user will notice the delay, but his/her flow of thought stays uninterrupted 10 sec – the limit for keeping the user's attention focused on the dialogue Requirements http: //www. ittelkom. ac. id/staf/yanuar

Designing the Search Page Making Decisions • Overall organization: – Spacious – Cramped • Others Overall organization: – Division of functionality to different pages – Positioning components in the interface – Emphasizing parts of the interface • Query insertion: insert text string or fill in text boxes • Interactivity of search results – Retrieve the information from the results – Narrow the search • Performance requirements Design http: //www. ittelkom. ac. id/staf/yanuar

Google http: //www. ittelkom. ac. id/staf/yanuar Spacious organization

Spacious organization http: //www. ittelkom. ac. id/staf/yanuar

Yahoo! http: //www. ittelkom. ac. id/staf/yanuar Cramped organization

Cramped organization http: //www. ittelkom. ac. id/staf/yanuar

Evaluation But what is usability? From ISO 9241 -11, Usability comprises the following aspects: • Effectiveness – the accuracy and completeness with which users achieve certain goals – Measures: quality of solution, error rates • Efficiency – the relation between the effectiveness and the resources expended in achieving them – Measures: task completion time, learning time, clicks number • Satisfaction – the users’ comfort with and positive attitudes towards the use of the system – Measures: attitude rating scales http: //www. ittelkom. ac. id/staf/yanuar Evaluation

The Best Search Engine http: //www. ittelkom. ac. id/staf/yanuar

The Best Search Engine? http: //www. ittelkom. ac. id/staf/yanuar

Try This! Bingand. Google http: //www. ittelkom. ac. id/staf/yanuar

Try This! Bingvs. Google http: //www. ittelkom. ac. id/staf/yanuar

Try This! Bingle. nu http: //www. ittelkom. ac. id/staf/yanuar

Try This! Blackdog. ie/google-bing/ http: //www. ittelkom. ac. id/staf/yanuar

Try This! Googleguy. de/google-yahoo/ http: //www. ittelkom. ac. id/staf/yanuar

Try This! bi. Goog http: //www. ittelkom. ac. id/staf/yanuar

Bing vs Google http: //www. ittelkom. ac. id/staf/yanuar

The Best Search Engine? http: //www. ittelkom. ac. id/staf/yanuar

The Best Search Engine http: //www. ittelkom. ac. id/staf/yanuar

Evaluation with Users Sessions Conduct • Conduct the session – Usability Lab – Simulated working environment • Observe the user – Human observer(s) – Video camera – Audio recording • Inquire satisfaction data Evaluation http: //www. ittelkom. ac. id/staf/yanuar

Evaluation with Users Results Analysis • If possible, use statistical summaries • Pay close attention to areas where users – were frustrated – took a long time – couldn't complete tasks • Respect the data and users' responses, don't make excuses for designs that failed • Note designs that worked and make sure they're incorporated in the final product. Evaluation http: //www. ittelkom. ac. id/staf/yanuar

Usability Laboratory Concept: Monitor users while they use system Evaluators User one-way mirror http: //www. ittelkom. ac. id/staf/yanuar

Usability Laboratory http: //www. ittelkom. ac. id/staf/yanuar

Evaluation Example: Eye Tracking http: //www. ittelkom. ac. id/staf/yanuar

Eye Tracking http: //www. ittelkom. ac. id/staf/yanuar

Google Evaluation Click-Through Data Number of users who clicked on link Rank of hit http: //www. ittelkom. ac. id/staf/yanuar

Google Evaluation Eye Tracking Data Number of users who viewed short record before first click Rank of hit http: //www. ittelkom. ac. id/staf/yanuar

Google Evaluation: Eye Tracking Data Part of short record viewed before first click (% of users) Title: 17. 4% Snippet: 42. 1% Category: 1. 9% URL: 30. 4% Other: 8. 2% (includes, cached, similar pages, description) http: //www. ittelkom. ac. id/staf/yanuar

Google Experiment: Click Through Data with Ranks Reversed Percentage of users who clicked on link Rank of hit http: //www. ittelkom. ac. id/staf/yanuar

http: //www. ittelkom. ac. id/staf/yanuar

YFA December 2008 (3 rd Edition), November 2008 (2 nd Edition), May 2008 http: //www. ittelkom. ac. id/staf/yanuar Adapted from cs. cornell. edu http: //www. ittelkom. ac. id/staf/yanuar