Teachers influence the student with their individuality, hence their knowledge, skills and attitudes in the field of diagnosis and therapy are the essence of the educational and didactic activities undertaken by the teacher in the school space. Competences are not a permanent value, they can be subject to change and they constitute the developmental professional potential of the teacher in the motivational, cognitive, emotional and social areas. The article presents a selected area of research

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... oncerning the sources of teaching knowledge and skills in the fields of diagnosis and therapy and their self-assessment, taking into account the nominal variables of age and additional qualifications. The presented text is part of a larger research project devoted to the diagnostic and therapeutic competences of teachers of public, inclusive and special schools.