Designing Assistive Technology for Blind Users
Kristen Shinohara · 2006 · Proceedings of the 8th International ACM SIGACCESS Conference on Computers and Accessibility (Assets '06) · doi:10.1145/1168987.1169062
Summary
This paper reports on an observational and interview case study of a congenitally blind college student (pseudonym Sara) conducted in her home to develop design insights for improving interactions between blind users and everyday technological artifacts. The researcher used Blythe's Technology Biographies method — a series of interview and observation strategies focused on specific elements of user-artifact interaction — across six two-hour sessions where Sara demonstrated how she uses items in her home including her computer, wristwatch, cell phone, Braille labels, Braille embosser, and CD player. The study focuses on understanding work-arounds: strategies a user employs to compensate for task failures, whether by impulse or deliberate design, using non-obvious elements to overcome the constraints of a physical and social environment. Data was analysed using Blevis's PRInCiPleS framework, which structures design knowledge as explanation, targeting two questions: what qualities make an artifact useful or useless as determined by work-arounds, and what design elements are most and least important to the user. The naturalistic home setting allowed the researcher to observe subtle tactics Sara employed to compensate for lack of sight, revealing insights that controlled laboratory studies would likely miss.
Key findings
The analysis revealed six key design insights from Sara's work-arounds. Socialization was central to Sara's technology use — she regarded it as an important part of her character, using a talking watch, bulletin board of pictures, and shared activities to fit into a sighted world seamlessly. Independence emerged as a strong value: Sara tackled problems from different angles until a solution was found, suggesting designs should support user capability without requiring sighted help. Control was important — designs should give users full control of as many functions as possible. Alternative identifiability (audio and tactile feedback) was crucial: Sara's hands, fingers, feet, nose, and ears compensated for her eyes, and designs incorporating alternatively identifiable features enhanced ease of use. Efficiency was a significant concern, as tasks like searching through CDs one at a time by reading Braille labels were time-consuming. Additional insights included portability, brute force backup (exhaustively trying all possibilities when designs fail), and flexibility. The study generated design concepts such as a hand-held CD scanner to read titles aloud via Braille, based on these insights.
Relevance
This paper demonstrates the value of conducting in-home ethnographic research with disabled users rather than relying solely on lab-based usability testing. The Technology Biographies method provides a practical template for understanding how blind users actually interact with technology in their daily lives, revealing the creative work-arounds they develop and the design failures they navigate. The six design insights — socialization, independence, control, alternative identifiability, efficiency, and flexibility — offer a useful framework for evaluating assistive technology design beyond basic task completion metrics. For practitioners, the key takeaway is that observing real-world use in naturalistic settings uncovers design needs that surveys and controlled experiments miss, and that blind users' strategies for overcoming design barriers are themselves a rich source of design requirements.
Tags: blindness · assistive technology · human-centered design · ethnography · case study · workarounds · tactile feedback · auditory feedback