Introduction: The "Programma Perspectief" intervention aims to provide optimal support to people with profound intellectual and multiple disabilities. Knowledge concerning intervention fidelity is outdated and scarce as is typical for the support of persons with special needs. Methods: An survey amongst care professionals (n = 62) yielded data on the application of core elements of the intervention (vision, methodical approach, and collaboration) in practise, as well as on implementation barriers and facilitators. Results: Vision and methodical approach are reflected in practise. A positive association was found between the number of perceived barriers and time since implementation. Over time, more barriers emerged at organisational level. Conclusions: The results reveal the importance of attending to implementation, even after years. Further research should focus on developing focused implementation strategies to enhance the sustainability of the analysed intervention, thereby guaranteeing the quality of support provided to people with profound intellectual and multiple disabilities.