Political decision-making is implemented in the framework of a classic sociotechnical system where respect has to be shown for both technical and social aspects. The development of suitable support tools for the previously mentioned requirements is rather complicated because a fundamentally important factor is product functionality and algorithm conformity to objective requirements (e.g. political decision quality assurance). Traditional design methods mainly focus on the quality of the system design process. They do ensure the quality of the decision-making process but not the decision quality itself. The inclusion of simulation in the system development process permits face validation for the decision-making algorithms of the goal system. This substantially improves acceptance and sustainability indices for the developed political decisions support system. The chapter deals with sociotechnical systems design peculiarities, emphasizing the role of simulation and social factors in the designing of policy decisionmaking support systems.