Overview and Revision for INFO3315

The exam

http://solpowerpeople.com/utility-interconnection/

Overview of HCI - 2015

• Core that is the bulk of the exam– In lectures and lab– Repetition– Linkages

• Beyond the core is smaller part– Just lecture or lab or homework– Hot topics

What is involved in the process of interaction design

While not done well enough:• Analysis:

– Understand users– Establish requirements– Learn what has been done before

• Design– Brainstorm alternatives creatively– Prototyping alternatives

• Implement– Prototypes of increasing fidelity

• Evaluate– Usability methods– Reflect on strengths and weaknesses of prototypes

Core

• Concepts eg mental model, affordance, accessibility, guidelines….

– Introduced and used through the semester – What do they mean– Why do they matter

• Techniques eg TA/HE/CW/GOMS

– What are they– When it is most appropriate to use them– How to use them– Trade-offs

• Technical – done as homework and demo-ed to tutor• Links between concepts, methods• Use concepts to explain, justify, critique a UI design

Bigger picture• Concepts and techniques for analysis, design, implement, evaluate

– Establishing user needs eg. ethnography, affinity diagram– Establishing requirements descriptions eg. One Sentence Statement, System Concept Statement, abstract

and concrete tasks– Ideation eg. Brainstorming, sketching– Design guidelines eg accessibility, Nielsen (many many of them)– Prototyping– Evaluation eg (TA, HE, CW, GOMS)

• Studying people– Observing users/participants eg. Ethnography, Think-aloud, (unobtrusive observation, field trials, logging

activity automatically)– What people say eg questionnaires (esp standard eg SUS), interviews, notes from think-aloud comments

(Focus groups)• Predicting usability (no users/participants involved)

– Heuristic evaluation (guidelines feed into design)– Cognitive walkthrough– GOMS

• Core characteristics of people, psychology, physiology, differences and theories– Fiits’, Norman’s model, attention, perception, memory

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Usability http://www.nngroup.com/articles/usability-101-introduction-to-usability/

• Learnability: How easy is it for users to accomplish basic tasks the first time they encounter the design?

• Efficiency: Once users have learned the design, how quickly can they perform tasks?

• Memorability: When users return to the design after a period of not using it, how easily can they reestablish proficiency?

• Errors: How many errors do users make, how severe are these errors, and how easily can they recover from the errors?

• Satisfaction: How pleasant is it to use the design?• (cf utility, Useful = usability + utility)

Novice Expert

No-users, predictive

* Cognitive Walkthough* Extended Cognitive WalkthoughHeuristic Evaluation

GOMS

Users involved Think-Aloud$ Observational study (lab or field)A/B studyMonitoring

See left

Key:$ Method that is typically higher costMethod we study – particularly useful, even for inexperienced evaluatorsOther method we study

Summary

• No tricks• Focus on the core• More challenging questions based on

assignment work• All aspects assessable

info3315 in context

• Focus on core of really valuable techniques• Overview of some broader aspects • Some hot topics, mainly linked to the project• Introduce basic web tech • All core concepts techniques are relevant to

existing and merging interfaces

Where next

• COMP5427 Usability Engineering• COMP5047 Pervasive Computing• Human Centred Technology projects

– Summer scholarship projects– Thesis projects