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More than 70% of agricultural workers with disabilities modify their tasks or work environment using "assistive technology" (AT) to enable them to continue working in this sector. Agricultural AT designers, including both professional and lay designers, seek to meet the needs and capacities of the disabled worker for whom the AT is intendedthe "primary user" generally adopting an "ergonomics-for-one" design approach. Rarely do AT designers consider how these modifications might affect co-workers"secondary users"who share the task or work environment with the primary user. A consequence of this lack of consideration during the design process may be an increase in risk of injury to secondary users, for whom the modified the task or work environment becomes sub-optimal due to the modifications.