1. Usability Benefits Quiz
Lawrence Najjar

2. Outline User interface, user experience, & usability
Usability benefits
Usability quiz
Prize!
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3. Terms
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4. What is a ”user interface?”
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5. What is a ”user interface?”
The way the user interacts with a software or hardware product
Includes screens, buttons, hyperlinks, entry fields, graphics, keyboard, mouse
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6. What does ”user experience” mean?
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7. What does ”user experience” mean?
The elements that affect how users perceive a product
Includes packaging, ease of use, graphics, response time, installation, product support
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8. What does ”usability” mean?
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9. What does ”usability” mean?
Ease of use of the product
Includes familiarity, simplicity, consistency, and intuitiveness
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10. Usability Benefits
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11. Usability Benefits Usability increases: Usability decreases:
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12. Usability Benefits Usability increases: Company reputation 10, 11
Competitive advantage 2, 7, 14
Ease of use
Productivity 5, 7
Revenue 2, 5, 7, 12, 14
User satisfaction 2, 5, 16
User trust 5
Usability decreases:
Development time 4, 5, 15, 16
Development costs 1, 2, 3, 4, 5, 6, 8, 9, 10, 13, 14
Documentation costs
Learning time 2, 5
Maintenance
Staff turnover 2, 7
Support costs 2, 5, 12, 16
Training 12, 16
User errors 2, 10
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13. Usability Benefits Quiz
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14. Usability Benefits Quiz Question
1. What percentage of a software application’s code is for the user interface? 5%
10%
25%
50%
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15. Usability Benefits Quiz Question
1. What percentage of a software application’s code is for the user interface? 5%
10%
25%
50%
Inveradi, R. (2005). Software engineering education in the modern age. Software Education and Training Sessions at the International Conference, on Software Engineering, ICSE 2005, St. Louis, MO, USA, May 15-21, 2005, Revised Lectures
Myers, B. A. and Rosson, M. B. (1992). Survey on user interface programming. In CHI ‘92 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, Available: www-2.cs.cmu.edu/afs/cs.cmu.edu/project/garnet/doc/papers/uisurveyCHI92.ps
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16. Usability Benefits Quiz Question
2. What percentage of development time is for the user interface? 5%
10%
25%
50%
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17. Usability Benefits Quiz Question
2. What percentage of development time is for the user interface? 5%
10%
25%
50%
Myers, B. A. (1995). User Interface Software Tools, ACM Transactions on Computer-Human Interaction, 2(1), pp
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18. Usability Benefits Quiz Question
3. What is the numeric rank of “user involvement” as a predictor of successful projects?
1st
3rd
5th
7th
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19. Usability Benefits Quiz Question
3. What is the numeric rank of “user involvement” as a predictor of successful projects?
1st
3rd
5th
7th
The Standish Group (1995). The CHAOS report [Online]. Retrieved from:
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20. Usability Benefits Quiz Question
4. What percentage of software defects is due to usability errors? 5%
15%
30%
60%
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21. Usability Benefits Quiz Question
4. What percentage of software defects is due to usability errors? 5%
15%
30%
60%
Inveradi, R. (2005). Software engineering education in the modern age. Software Education and Training Sessions at the International Conference, on Software Engineering, ICSE 2005, St. Louis, MO, USA, May 15-21, 2005, Revised Lectures
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22. Usability Benefits Quiz Question
5. After making usability improvements on LaQuinta.com, by what percentage did annual revenue growth increase? 5%
35%
65%
85%
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23. Usability Benefits Quiz Question
5. After making usability improvements on LaQuinta.com, by what percentage did annual revenue growth increase? 5%
35%
65%
85%
Peterson, M. (2007). UX Increases Revenue: Two Case Studies. User Experience Magazine, 6(2). Retrieved from 
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24. Usability Benefits Quiz Question
6. After making usability improvements on IBM.com, by what percentage did e-commerce sales increase? 1% 4%
40%
400%
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25. Usability Benefits Quiz Question
6. After making usability improvements on IBM.com, by what percentage did e-commerce sales increase? 1% 4%
40%
400%
Tedeschi, B. (1999, August 30). Good Web site design can lead to healthy sales. New York Times e-commerce report [On-line]. Retrieved from:
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26. Usability Benefits Quiz Question
7. After making usability improvements on Dell.com, how much did daily online purchases increase?
$1,000,000
$8,000,000
$18,000,000
$35,000,000
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27. Usability Benefits Quiz Question
7. After making usability improvements on Dell.com, how much did daily online purchases increase?
$1,000,000
$8,000,000
$18,000,000
$35,000,000
Black, J. (2002, December 23). Usability: The ROI in good design. ZDNet. Retrieved from:
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28. Usability Benefits Quiz Question
8. After making improvements on a very, very popular e-commerce site, how much did annual revenue increase?
$30,000
$300,000
$3,000,000
$300,000,000
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29. Usability Benefits Quiz Question
8. After making improvements on a very, very popular e-commerce site, how much did annual revenue increase?
$30,000
$300,000
$3,000,000
$300,000,000
Spool, J. (2009). The $300 million button. Retrieved from:
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30. Summary
Usability can increase customer satisfaction & revenue while decreasing development & support costs
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31. Prize! Removable, vinyl sticker, 1.5 inches wide x 1.0 inches high
your name and physical mailing address to:
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32. References
1 Barker, D. T. (2000). Cost benefits of usability engineering.
2 Bevan, N. (2005). Cost benefits evidence and case studies. Retrieved from:
3 Boehm, B. (1987). Industrial software metrics top 10 list. IEEE Software, 4(5),
4 Bosert, J. L. (1991). Quality Functional Deployment: A Practitioner’s Approach. New York: ASQC Quality Press.
5 Ehrlich, K., & Rohn, J. (1994) Cost justification of usability engineering: A vendor’s perspective. In R. Bias & D. Mayhew (Eds.), Cost-justifying usability (73-110). San Diego: Academic Press.
6 Harrison, M. C., Henneman, R. L., & Blatt, L. A. (1994). Design of a human factors cost-justification tool. In R. Bias & D. Mayhew (Eds.), Cost-justifying usability ( ). San Diego: Academic Press.
7 Karat, C-M. (1994). A business case approach to usability cost justification. In R. Bias & D. Mayhew (Eds.), Cost-justifying usability (45-70). San Diego: Academic Press.
8 LaPlante, A. (1992, July 27). Put to the test. Computerworld, 27(75).
9 Lederer, A. L., & Prasad, J. (1992). Nine management guidelines for better cost estimating. Communications of the ACM, 35(2) (February),
10 Marcus, A. (2005). User interface design’s return on investment: Examples and statistics. In R. Bias & D. Mayhew (Eds.), Cost-justifying usability: An update for an Internet age (17-39). San Diego: Academic Press. Version retrieved from:
11 Mauro, C. (1994). Cost-justifying usability in a contractor company. In R. Bias & D. Mayhew (Eds.), Cost-justifying usability ( ). San Diego: Academic Press.
12 Mayhew, D. & Mantei, M. (1994). A basic framework for cost-justifying usability engineering. In R. Bias & D. Mayhew (Eds.), Cost-justifying usability (9-43). San Diego: Academic Press.
13 Nielsen, J. (1993). Usability engineering. San Francisco: Morgan Kaufmann.
14 Rajanen, M., & Jokela, T. (2004). Analysis of usability cost-benefit models. In T. Leino, T. Saarinen, & S. Klein (Eds.), ECIS 2004 Proceedings, 115. Retrieved from
15 Richeson, A., Bertus, E., Bias, R. G., & Tate, J. (2011). Determining the value of usability in Web design. In K-P. L. Vu & R. Proctor (Eds.), Handbook of Human Factors in Web Design (2nd ed.)
16 Weinschenk, S. (2005). Usability: A business case. Retrieved from:
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