“…In addition, we have reported important novel findings about the practicalities, challenges, and benefits of involving people with complex speech and motor disorders who use AAC and their family members in research. Although this group is increasingly involved in the development of assistive technology and AAC devices using participatory design methodologies ( Hamidi et al, 2015 ; Ibrahim et al, 2020 ), their involvement in research is less common ( Moulam et al, 2020 ). While some individuals who use AAC are known to be lead or co-investigators in both AAC and other research fields, there is little research evaluating their experience as co-investigators or specifically focused on any barriers and facilitators to their involvement and how this affects project outcomes.…”