ObjectiveTo identify factors influencing the engagement of older adults with neurocognitive disorders (NCDs) in the design of decision aids (DAs). MethodsWe conducted a qualitative descriptive study using semi-structured interviews with 23 older adults with NCDs who were accompanied by 27 caregivers. This is a secondary analysis of a published study to identify the features of DAs designed for this population and their caregivers. ResultsSeveral behaviours and attitudes of caregivers and researchers hindered the older adults’ engagement in the DA design process. Specific communication strategies can be employed to support their engagement and overcome the communication challenges inherent to this population, such as memory, attention, hearing, or visual impairments. Adopting the appropriate attitude, taking the time, and providing guidance to the older person can help them focus on the topic, while developing trust between participants is a facilitator to obtain their feedback. ConclusionFindings from this project could serve to inform the communication and co-design of DAs with older people with NCDs and their caregivers. Practice implicationsCaregivers and researchers have key roles to play in facilitating communication with older persons with NCDs so they are empowered to help in co-designing DAs.