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Evaluation

Evaluation. Bruce Tognazzini tells you why you need to evaluate.

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Evaluation

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  1. Evaluation

  2. Bruce Tognazzini tells you why you need to evaluate “Iterative design, with its repeating cycle of design and testing, is the only validated methodology in existence that will consistently produce successful results. If you don’t have user-testing as an integral part of your design process you are going to throw buckets of money down the drain.” See AskTog.com for topical discussions about design and evaluation.

  3. The language of evaluation • Analytical evaluation • Controlled experiment • Field study • Formative evaluation • Heuristic evaluation • Predictive evaluation • Summative evaluation • Usability laboratory • User studies • Usability studies • Usability testing • User testing

  4. Evaluation approaches • Usability testing • Field studies • Analytical evaluation • Combining approaches • Opportunistic evaluations

  5. Usability testing http://video.google.com/videoplay?docid=-7301605255558498262

  6. Characteristics of approaches

  7. Evaluation approaches and methods

  8. Challenge & engagement in a collaborative immersive game • Physiological measureswere used. • Players were more engaged when playing against another person than when playing against a computer. • What were the precautionary measures that the evaluators had to take?

  9. What does this data tell you?

  10. The HutchWorld patient support system • This virtual world supports communication among cancer patients. • Privacy, logistics, patients’ feelings, etc. had to be taken into account. • Designers and patients speak different languages. • Participants in this world can design their own avatar. Look at the “My appearance” slide that follows. How would you evaluate it?

  11. My Appearance

  12. Key points • Evaluation & design are closely integrated in user-centered design. • Some of the same techniques are used in evaluation as for establishing requirements but they are used differently (e.g. observation interviews & questionnaires). • Three main evaluation approaches are:usability testing, field studies, and analytical evaluation. • The main methods are: observing, asking users, asking experts, user testing, inspection, and modeling users’ task performance. • Different evaluation approaches and methods are often combined in one study. • Triangulation involves using a combination of techniques to gain different perspectives, or analyzing data using different techniques. • Dealing with constraints is an important skill for evaluators to develop.

  13. Web Usability http://www.useit.com/alertbox/20030825.html

  14. Website Usability testing http://video.google.com/videoplay?docid=644080857245788545&hl=en http://video.google.com/videoplay?docid=8759121599386354872&vt=lf&hl=en

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