DESIGNING FOR USABILITY – USER CENTERED DESIGN Presentation by Carlos Jensen, Phd

Usability & User experience goals –Satisfying –Enjoyable –Fun –Entertaining –Helpful –Motivating –Aesthetically pleasing –Supportive of creativity –Rewarding –Emotionally fulfilling Increase learnability Increase efficiency Increase memorability Decrease errors Increase satisfaction Increase utility Increase effectiveness

User-Centered Design Process 1.Identify users 2.Identify activities/context 3.Identify needs 4.Derive requirements 5.Derive design alternatives 6.Build prototypes 7.Evaluate prototypes 8.Iterate (rinse and repeat) 9.Ship, validate, maintain

Studying Users Questionnaires Interviews Focus groups Naturalistic observation –Ethnomethodological –Contextual inquiry –Participatory design Documentation/Artifacts

From Observation to Design Structuring observations by generating Use Cases Scenarios Hierarchical Task Analysis Flow Charts Entity-relationship diagrams Etc.

Deriving Design Alternative Inherently creative process (inspiration) Participatory design Look at following for inspiration? –Previous designs –Competitors –Related/unrelated systems Brainstorming Independent/competing teams Prototyping

Prototype and Evaluation Early design Late design Medium-fidelity High-fidelity (computer-based) Low-fidelity (paper-based) Empirical studies Cognitive walkthrough Heuristic evaluation Rough out on paper Action analysis Formative evaluation Functional prototype