CS 147 Intro to HCI Dan MaynesAminzade Before

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

After 2 nd Usability Review After Usability

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

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

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

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

Constraints • Restricting interaction to reduce errors

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

Mapping • Relationship between controls and their effects on the world

Visibility • Making it obvious which actions are available

Feedback • Send information about what is happening back to the user

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

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

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)