The Theoretical Domains Framework (TDF) investigates the determinants influencing the implementation behaviour of actors in healthcare. Caring for people with dementia (PWD) can be burdensome. Therefore, caring relatives (CRs) often rely on support of various actors in their community (CAs). However, the support of this target group is not sufficient, and the implementation of support services needs to be optimised. As it stands, there is no German-language questionnaire to investigate the factors that influence the implementation behaviour of CAs. Therefore, based on the TDF, the Community Implementation Behaviour Questionnaire (CIBQ) was developed in this study. A total of 205 CAs from 16 German communities were surveyed. The 34-item CIBQ asked about their implementation behaviour regarding support services for CRs of PWD. To identify the best model fit, the internal consistency and construct validity were computed. After adaptation, the final CIBQ consisted of ten domains and thirty-one items. The psychometric properties of the questionnaire are as follows: CMIN/DF = 1.63; SRMR = 0.05; RMSEA = 0.07; CFI = 0.92; Cronbach's alpha 0.74-0.89; inter-item correlation 0.38-0.88. The initial results show satisfactory internal consistency and construct validity of the CIBQ. Using the CIBQ enables the health and care optimisation of CRs of PWD.
