This introductory work presents the psychological aspects relevant to preclinical practice. With its compact and practical orientation, it is aimed not only at paramedics and emergency medical technicians but also at personnel from police and fire services. The groups of victims and helpers, along with their psychological burdens, are introduced. Building on this, the possibilities for assistance in everyday operations as well as in special situations such as suicide attempts or major disaster events are thoroughly outlined. Psychological study results are consistently integrated in a practical manner. The core of the guide consists of easily memorable rules and action instructions for deployment. The foundational knowledge, enriched with concrete formulations and real patient situations, prepares readers for a thoroughly mindful approach to patient care.