Many authors have proposed the existence of common principles of counselling and psychotherapeutic change. However, little is known about how practitioners use these change principles. A sample of 373 Czech psychotherapists and counsellors participated in an online survey and rated their use of 10 psychotherapy change principles in their practice over the previous year. The frequency of the use of the 10 change principles is reported. Furthermore, three principal components of the change principles were identified: exploration, acceptance, and understanding of clients' experience; attending to clients' own resources; and furnishing clients with new skills and advice. The use of these components was mainly associated with the practitioner's theoretical orientation. The implications of the component structure for psychotherapist and counsellor training and practice are discussed.