Assessing the application of non-pharmacological interventions for people with dementia in German nursing homes: feasibility and content validity of the dementia care questionnaire (DemCare-Q)

A literature review, expert rating and multi-method pre-test are important steps of questionnaire development. The applied methods ensure content validity and the practicability of the instrument. The publication of this process enhances the transparency of questionnaire design and supports researchers in solving problems in developing questions to assess the application of interventions. Since these are initial steps of questionnaire development, further testing of its reliability is needed.