Case studies represent a methodology suitable for practice-oriented research. In this article, case studies are introduced as a natural way of gaining knowledge, within which psychotherapists can use skills which are a natural part of their psychotherapy practice. Basic steps of conducting a case study are explained in the article: (1) etermination (Why do we do case study?);(2) Preparation (What do we want to know?); (3) Data collection (What could a minimalistic version look like?); (4) Analysing and writing down (The usual structure of an empirical study). The article introduces case studies as a meaningful and enriching way of integrating research into psychotherapy training and professional development of psychotherapists in practice.