What matters in development and sustainment of community dementia friendly initiatives and why? A realist multiple case study

BACKGROUND: Dementia friendly communities (DFCs) are seen as key to participation of people with dementia and carers. Dementia-friendly initiatives (DFI) are important building blocks for the growth of DFCs. Therefore, it is essential to understand how DFIs are developed and sustained to secure the growth of DFCs. This study identifies contextual factors and mechanisms that influence the development and sustainment of Dutch DFIs. It also explains how these contextual factors and mechanisms are interrelated and the outcomes to which they lead. METHODS: Mixed methods, namely interviews, observations, documentation and focus groups, were used for this realist multiple case study. Participants were professionals (n = 46), volunteers (n = 20), people with dementia (n = 1) and carers (n = 2) who were involved in development and sustainment of DFIs in four Dutch DFCs. RESULTS: This study revealed three middle-range program theories as final outcomes: development of a support base, collaboration, and participation in DFIs by people with dementia and carers. These theories address institutional, organisational, interpersonal and individual levels in the community that are essential in development and sustainment of DFIs. CONCLUSIONS: The development and sustainment of DFIs requires the development of a support base, collaboration, and participation in DFIs by people with dementia and their carers. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12889-023-15125-9.