This document summarizes literature on the non-use of assistive technology devices. It defines non-use in various ways and identifies personal, device, environmental, and intervention-related factors that can influence non-use. Personal factors include the user's acceptance of disability and preferences for multiple devices. Device factors include quality, appearance, portability, and adaptability to individual needs. Environmental support from a user's social circle also impacts non-use. Intervention-related factors like involvement in device selection and follow-up support can increase retention and proper use. Strategies to address non-use include improving professional communication skills, recycling systems, and training programs.