Process evaluation of a New psychosocial goal-setting and manualised support intervention for Independence in Dementia (NIDUS-Family).

Key causal pathway mechanisms were: a respectful, trusting and impartial relationship with the facilitator: supporting the development of meaningful goals and support to find manageable solutions. Core implementation factors were delivery of the modules from a consistent facilitator across regular sessions. Core contextual factors influencing these mechanisms were dyadic participation and understanding of abilities.