things to know and review…

Logical order for HCI methods Differences between ethnographic studies and experiments (and pros & cons) Task analysis Requirements analysis Usability testing GROUP PROJECT: Dialog design

User-Centered System Design Task analysis tells us how people currently accomplish a task. (assign. #7) Requirements analysis tells us what a system should do. Usability testing tells us whether a system performs acceptably when a user tries to carry out certain tasks. (assign. #8) User-Centered System Design brings these things together.

“Great design starts with empathy” A very simple task analysis: Task analysis tells us how people currently accomplish a task or cope with a problem “Great design starts with empathy” A very simple task analysis: What’s wrong with the pediatrician’s waiting room? Gathering information One approach to interviewing What info to gather? Thinking outside the box Ideo method cards Group project: What kind of situation or problem would you like your dialog design to address? What if anything do people do now?

Requirements analysis: What a system should do

Usability testing evaluation of an existing system or prototype less formal than a laboratory study, more formal than just asking users what they think. for instance, watch people use a prototype to do an assigned task (user studies)

User studies Systematic user testing, often having each user do the same task(s).

User studies (Gomoll, 1990) Set up observation (tasks, users, situation) Describe the evaluation’s purpose Tell user she can quit at any time Introduce equipment Explain how to “think aloud” Explain that you will not provide help Describe tasks and system Ask for questions Conduct the observations (debrief the subject) Summarize results