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2. What is Usability?. A multidimensional constructInterface effectiveness, usefulness, usableness, ease of use, fit for use, effectiveness, efficiency, satisfaction, learnability, memorability, error tolerant, understandability, appropriate level of interaction, control, helpfulness, adaptability,
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1. Usability Assessment of Academic Digital Libraries Judy Jeng
Library Assessment Conference
September 25-27, 2006
2. 2 What is Usability? A multidimensional construct
Interface effectiveness, usefulness, usableness, ease of use, fit for use, effectiveness, efficiency, satisfaction, learnability, memorability, error tolerant, understandability, appropriate level of interaction, control, helpfulness, adaptability, the quality of being engaging, and flexibility
User focus
3. 3 Techniques of Usability Evaluation Formal usability testing
Usability inspection
Heuristic evaluation
Card sort
Category membership expectation
Cognitive walkthrough
Claims analysis
CASSM
Focus groups
Questionnaires
Think aloud
Analysis of site usage logs
Paper prototyping
Field study
4. 4 What have been studied? Design
Structure
Interface
Navigation
Functionality
Utility
Breadth of coverage
Metadata appropriateness
Awareness of library resources
Terminology
5. 5 Major Usability Problems in Digital Libraries User lostness
The study of ACM Digital Library, the Networked Computer Science Technical Reference Library, and the New Zealand Digital Library found that 73% of the subjects experienced different degrees of lostness
Alexandria Digital Library also report this problem
Navigation disorientation is among the biggest frustrations for Web users
6. 6 Lack of Benchmarks
MIT Libraries had 75% success rate. Is this high or low?
University of the Pacific and University of Illinois at Chicago also report their performance data.
We need more performance data to compare
7. 7 Ambiguity of terminology and the need for better labeling
Library Web sites are designed from a librarians perspective
When users do not find something in the online catalog, they immediately conclude that the library does not own the item
8. 8 Usability Evaluation Model