Social interaction is a fundamental aspect of human needs. However, people with mental or physical disabilities often lack individual opportunities for socializing. For them, it is hard to initiate social contact in everyday life – even if they share flats and daily rituals. At the same time, digital media cannot be used to create a balance for missing interaction in real life, due to lack of interest and know how. This paper describes a human-centered design process leading to an experimental product solution to address the mentioned communication gap. At first qualitative user research studies including observations and interviews illustrate the social situation of people with disabilities in assisted shared living. Furthermore, it will be shown how user requirements are translated into an experimental interactive prototype that promotes social interaction between people with disabilities. A wall-mounted cuckoo clock represents the installation. The clock proposes either suggestions for shared free-time activities or even allows users to promote their ideas through a playful and intuitive physical user interface. Thereby, it supports the development of family-like welfare and independent decision-making. A subsequent expert survey underlines the relevance and need of the product in facilities for PWD. This interaction design study represents an essential basis for the development of further concepts for the improvement of social interactions. At the same time, long-term research results are to be achieved through the future implementation of the assistance system.