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IEEM552 - Human Computer Systems Week 2 - A usability study February 23, 1999

IEEM552 - Human Computer Systems Week 2 - A usability study February 23, 1999. Dr. Vincent Duffy - IEEM http://iesu5.ieem.ust.hk/dfaculty/duffy/ 552 email: vduffy@ust.hk. 1. Today and next few weeks. Week 4 - Tuesday, 23rd February in week 4 - select papers for oral presentations

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IEEM552 - Human Computer Systems Week 2 - A usability study February 23, 1999

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  1. IEEM552 - Human Computer Systems Week 2 - A usability study February 23, 1999 Dr. Vincent Duffy - IEEM http://iesu5.ieem.ust.hk/dfaculty/duffy/552 email: vduffy@ust.hk 1

  2. Today and next few weeks • Week 4 - Tuesday, 23rd February • in week 4 - select papers for oral presentations • finalize groups of 2 or 3, • present during wk.6,7,9,10, or 11 • first a practice exercise - homework due by noon Tuesday 23rd by email (no attachment) • details in just a few minutes minute • Week 5 - Monday, March 1 • OSHC seminar 9am-6pm (no Tuesday class) 2

  3. For today - week 4 • Postpone demonstration until week 6 • Administrative • Determine teams and select papers for oral presentations • handout (references & week due) • Discuss trip Monday, March 1 (week 5) • no class meeting Tuesday • handout (who is registered, who needs travel arrangments, reg. code) • what to look for at the conference? 3

  4. Today continued • Guidelines on VDT (video display terminal) use in the workplace • Permission for the I.S. Lab • user access card • New content: • Economic benefit or Cost/benefits Analysis: Assessing Usability (Ch.1-p.11-17) • Mantei and Teori method & • For Discussion/lecture : A usability study • summary of Nielsen - thinking aloud method 4

  5. Things to consider for presentation • See 10 ways to look at a research paper • also - 1. Objective of the research • 2. Brief discussion of literature support • 3. Development of hypotheses (if any) … or why the research was done in this way • 4. Methods • 5. Results • 6. Discussion/conclusions • any practical application for the research? • Theoretical contribution? • 7. Future work: any suggestions 5

  6. 10 ways to look at a research paper systematically for critical analysis • 1. research ideas/question -what is the purpose? • 2. what background support? - literature review • 3. theoretical basis for analyzing question/hypothesis? • 4. applicability-practical contribution? • 5. theoretical contribution? • 6. appropriate methodologies for carrying out study? (determining variables, data collection, method used to test hypotheses, validity of measures and reliability) • 7. appropriate statistical analyses and assumptions? • 8. presentation of results: what do they really mean? • 9. conclusions drawn: are they reasonable? • 10. future work/research directions: any possibilities? 6

  7. For oral presentation • Please determine groups of two • choose the paper of your interest for presentation • library catalog - images reserve 7

  8. Due Week 4 – Today- Estimating the Number of Subjects Needed for a Thinking Aloud Test, J.Nielsen, International Journal of Human-Computer Studies, 41, 385-397, 1994. (no presentation) • Week 5 - March 1 - A Study on Prevalence of Musculoskeletal Discomfort Among Visual Display Terminals (VDT) Users in Hong Kong, W.S. Tang, ERGON-AXIA, Proceedings of the First World Congress on Ergonomics for Global Quality and Productivity, Ed. Bishu, Karwowski and Goonetileke, p.6-30, 1998. (no presentation) • Week 6 - March 9 - An Empirical Assessment of Task Complexity for Computerized Menu Systems, J.A. Jacko, International Journal of Cognitive Ergonomics, 1 (2), 137-147, 1997. • Week 7 - March 16 - The Effect of Pictogram-Based Interface Design on Human-Computer Performance, L.A. Miller and K.M. Stanney, International Journal of Human-Computer Interaction, 9 (2), 119-131, 1997. • Week 8 - Mid-term Exam • Week 9 - March 30 - Using Natural Language Conventions in the User Interface Design of Automatic Speech Recognition Systems, D.J. Brems, M.D.Rabin, J.L.Waggett, Human Factors, 265-282, 1995. • Week 10 - April 13 - Development and Evaluation of the Windows Computer Experience Questionnaire (WCEQ), L.A. Miller, K.M. Stanney, W.Wooten, International Journal of Human-Computer Interaction, 9 (3), 201-212, 1997. • Week 11 - April 20 - Temporal Issues of Quality of Working Life and Stress in Human-Computer Interaction, P.Carayon, International Journal of Human-Computer Interaction, 9 (4), 325-342, 1997. • Week 12 - April 27 - Persuasiveness of Expert Systems, J.J.Dijkstra, W.B.G.Liebrand, E.Timminga, Behaviour and Information Technology, 17 (3), 155-163, 1998.

  9. Homework due before next class meeting • 1. Please read the following before going to the Symposium. • Week 5 - March 1 - A Study on Prevalence of Musculoskeletal Discomfort Among Visual Display Terminals (VDT) Users in Hong Kong, W.S. Tang, ERGON-AXIA, Proceedings of the First World Congress on Ergonomics for Global Quality and Productivity, Ed. Bishu, Karwowski and Goonetileke, p.6-30, 1998. (no presentation) • 2. While at the Symposium. Please plan to discuss your knowledge with someone there and ask someone an intelligent question about it. • 3. Please tell the name and affiliation of the person you spoke with and summarize your question and answer/discussion (up to 1 paragraph).. • Please submit it by noon Tuesday of Week 6 (can be done in group of 2). • 4. Please read the following and be prepared to ask a question during/after the discussion/presentation) • Week 6 - March 9 - An Empirical Assessment of Task Complexity for Computerized Menu Systems, J.A. Jacko, International Journal of Cognitive Ergonomics, 1 (2), 137-147, 1997. 9

  10. Recall: H.W. For week 4 • 2. Economic Benefits of User Interface design • read chapter 1-Eberts-User Interface Design • consider the Mantei and Teori method. • Q. Could it have been used by Microsoft (for Word for DOS) for determining the economic benefits of increased usability? • Yes/No and 1 sentence is sufficient. 10

  11. Economic benefits of Usability analysis • assessing user interfaces • benefits? • faster task completion times, less errors, reduced costs for training (help required) • Bullinger, Burmester, Vossen, 1995 • learning times, user error, cost of maintenance • Eberts, 1994; Mantei and Teory, 1988; Karat 1992 • costs? • focus groups, building mock-ups, prototype, design changes, running the studies, making test environment, conducting the user survey 11

  12. Economic benefits of Usability analysis • total savings • learning time + user errors + maintenance costs • learning time • turnover, training time saved, wages • cost of errors per year • # of employees, searches/hr, hr/yr, P(error), time to fix error, wages • maintenance costs (design change savings) • # of changes (25?), hrs to change (8?), wages • late change 4x early cost (late cost minus early cost) 12

  13. Recall: H.W. For week 4 • 2. Economic Benefits of User Interface design • read chapter 1-Eberts-User Interface Design • consider the Mantei and Teori method. • Q. Could it have been used by Microsoft (for Word for DOS) for determining the economic benefits of increased usability? • Yes/No and 1 sentence is sufficient. 13

  14. Economic benefits of Usability analysis • Assumption of this method? • Mantei and Teory - mostly concerned with in-house software use • if company is selling software, then how different? • improvement= increased revenue • = cost * percent of increase * sale of old units • Why not for Microsoft case? • It is about whether or not the software will sell better than that already on the market. 14

  15. Recall H.W. - week 4 • 1. research paper for next week • Nielsen, J. (1994) Estimating the number of subjects needed for a thinking aloud test Int. J. of Human Computer Studies 385-397. • using the 10 ways to look at a research paper • choose 3 subheadings in the ‘10 ways’ and write 3 sentences about each. • Choose 1 subheading and write 1 sentence about why you didn’t choose it. 15

  16. Nielsen paper • Thinking aloud…how does it work • see video • Do you agree or disagree w/the following • Thinking aloud method was not widely used because of its complexity and high cost. • True/false? • Actually…usability studies where many subjects are needed to show quantitative results are of high cost. • Nielsen is pointing out that a large % of problems can be found with a small # of subjects. 16

  17. Remember: homework due before next class meeting • 1. Please read the following before going to the Symposium. • Week 5 - March 1 - A Study on Prevalence of Musculoskeletal Discomfort Among Visual Display Terminals (VDT) Users in Hong Kong, W.S. Tang, ERGON-AXIA, Proceedings of the First World Congress on Ergonomics for Global Quality and Productivity, Ed. Bishu, Karwowski and Goonetileke, p.6-30, 1998. (no presentation) • 2. While at the Symposium. Please plan to discuss your knowledge with someone there and ask someone an intelligent question about it. • 3. Please tell the name and affiliation of the person you spoke with and summarize your question and answer/discussion (up to 1 paragraph).. • Please submit it by noon Tuesday of Week 6 (can be done in group of 2). • 4. Please read the following and be prepared to ask a question during/after the discussion/presentation) • Week 6 - March 9 - An Empirical Assessment of Task Complexity for Computerized Menu Systems, J.A. Jacko, International Journal of Cognitive Ergonomics, 1 (2), 137-147, 1997. 17

  18. for next class meeting - week 6 • in class demonstration - March 9 • postponed from this week • all groups will participate in collecting data • compare two interfaces • analyze the data, interpret the results • estimating the benefits - • we will compare library cat for dos/www • meet in the I.S. Lab • first half of class • 3rd floor - near 3203 18

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