This article describes data collection within an Australian mixed methods study that investigated family carers' stress levels and experiences of dementia services and the cognitive and functional abilities of individuals experiencing dementia. Qualitative and quantitative data were collected via a "progressive engagement" process involving "multidisciplinary functioning," "unambiguous protocols," and "participant-centered procedures." The approach achieved high-quality data and 100% participant retention. Study details are located within a broader discussion of mixed methods research in the social sciences and a pragmatic paradigm fitting to dementia research. The article contributes to the field of mixed methods research by highlighting philosophical issues relevant to dementia researchers and by providing sufficient depth of detail for interested readers to adopt or adapt the authors' mixed methods procedures.