Basing on the example of one patient and her family, the system family consultation - as a way towards therapeutic dialogue - is presented. The patient was hospitalised due to schizophrenia. In the given example, the psychiatrist was an observer of the consultation conducted by the psychologist. A system therapy consultation allowed a multiple-picture to be obtained: the family members and the patient presented their own understanding of the situation. This new multi-perspective description - showing the patient's symptoms functionality caused diagnostic uncertainty in the psychiatrist - how far is the diagnosis of schizophrenia a justifiable one. According to the authors, the systemic consultation, giving the possibility to empathize with existential, psychological and family problems of the patient, leads to a dialogue with his/her family and it plays one of the most important roles in the therapeutic and diagnostic process.