1. Before usability CS 147: Intro to HCI Dan Maynes-Aminzade After 1 st Usability Review

2. After 2 nd Usability Review After Usability

3. After feedback from Don Norman (which cost me $25,000)

4. Plans for Today Assignment 2 discussion in small groups Group discussion of lessons learned from Assignment 2 Quick summary of project proposals + discussion Terminology recap Form groups for projects

5. Terminology of Interactive System Design Affordances Constraints Conceptual Models Mappings Visibility Feedback

6. Affordances Attribute of an object that allows people to know how to use it

7. Constraints Restricting interaction to reduce errors

8. Conceptual Model A set of ideas about how an interactive system behaves vs.

9. Mapping Relationship between controls and their effects on the world

10. Visibility Making it obvious which actions are available

11. Feedback Send information about what is happening back to the user

12. Usability Breakdown My action causes something I did not expect or want I want to do something, and cannot figure out how

13. Assignment 1 Grading Criteria Good –Chose an appropriate interactive interface, and described its problems in terms of the principles in the readings –Characterized the breakdown as described in the assignment: what was tried, what was expected, what happened –Described the issue in specific terms, using terminology and principles from the readings –Suggested an alternative design that solved the problem and described how it was better grounded in the general principles

14. Assignment 1 Grading Criteria Bad –Chose a technology problem rather than a design problem (e.g. “system crashed” or “device was broken”) –Copied one of the examples from the reading –Explained in vague terms (e.g. “design was bad”) –Didn’t offer an alternative design –Didn’t show evidence of doing the reading (didn’t use the appropriate principles, or applied them incorrectly)