Devices and software used for augmented, virtual and mixed-mode reality are designed to enhance many everyday activities, including training, work, movies and games. But their success in the marketplace depends on a great end-user experience. In this competitive market, proper design and usability testing is critical for product success. Good design is guided by good usability testing. Design should consider function, users, aesthetics, comfort and other factors. Digital-human modeling may be useful in the design process. The design of some products for human computer interaction should consider international standards (e.g., ISO 9241). Usability testing can evaluate user acceptance, preference, error, comfort, fatigue, anthropometry and other factors. Usability testing should not just be tacked onto the end of the design process but should be used throughout the design process.

The presentation will discuss the design process and factors that led to products that failed and products that were successful in the marketplace. The presentation will introduce anthropometry data sources useful for the design of head mounted displays and the design of hand-held controllers and how the these data sources can be used for human-digital modeling. The core of the presentation will focus on the proper structuring of usability testing with the application of validated tools and methods for assessing subjective acceptance, comfort, fatigue, and throughput. Task design, questionnaire design, electromyography, infrared imaging and other methods will be discussed. Other critical usability test issues will be discussed, such as the selection and recruitment of test subjects, number of subjects, study duration, and data analysis. Finally, the integration of usability test results into the design process will be presented using case studies with hand-held devices.

The objectives for the talk include (1) an understanding of how usability testing can be integrated into the design process, (2) an understanding of the critical factors to consider in the structuring of usability testing, and (3) an understanding of how to conduct high quality usability testing.

Dr. David Rempel is Professor Emeritus in the Department of Bioengineering at the University of California at Berkeley and in the Department of Medicine at the University of California at San Francisco. He was Director of the Ergonomics Graduate Training Program at the University of California at Berkeley from 1990 to 2016 and continues to oversee experiments and mentor graduate students. The laboratory conducts basic research on human physiology, fatigue and injury related to the use of hand-held tools and also applied research on methods for evaluating devices used in human-computer interaction and other industries. He is Board Certified in Internal Medicine, Occupational Medicine, and Ergonomics. He is a member of the US National Academy of Sciences’ Board on Human Systems Integration. Dr. Rempel provides ergonomics consulting to Amazon, Apple, Boeing, Hewlett-Packard, Logitech, Magic Leap, Microsoft, and Herman Miller. His 170 papers, 400 abstracts, and 18 book chapters are listed at www.ergo.berkeley.edu.

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