A clinical decision support system for primary care can support the diagnosis of patients with unclear diseases by exchanging information with the patients. In a user-centred design process, we want to elaborate which tasks these stakeholders would like to perform in the system and how these requirements can be meaningfully integrated into the system, taking into account the needs of general practitioners as main stakeholder. 3-steps including user requirement analysis, derivation of functional requirements and development of a first prototype were conducted. This process led to 23 user requirements and 9 common functional requirements of both stakeholder groups, as well as a first prototype of the patient dashboard. The early inclusion of various user feedbacks facilitated the implementation of a user interface for a user-friendly decision support system.