The aims of scientific research of the process of psychotherapy for various mental disorders are discussed in the article. The necessity of the universal design concepts development in the field of clinical psychotherapy with the aim of harmonizing the main investigated parameters of the psychotherapeutic process is reflected in the article. It is shown that the target of psychotherapy is the key parameter while carrying out a psychotherapy research process. Differences in the understanding of this term by different authors are described here. The necessity of different types of categories and planes detection of psychotherapy targets, establishing their typology and classification are presented.