The requirements for the quality of the teacher's pedagogical work and its assessment are constantly increasing. The paper focused on knowledge related to teacher competence. It resulted from research activities in several scientific research projects (e.g. the Slovak Research and Development Agency, Evaluation of Teacher Competencies), implemented at the University of Constantine the Philosopher in Nitra (Slovakia). The team of Slovak experts and teachers monitored (researched) the possibilities of identifying a complex of relevant professional competencies that need to be taken and developed. Overall, the research work within the national survey in the Slovak Republic was determined ten essential competencies of a teacher. The aim of the paper is to introduce the competence of a teacher - the competence to develop a positive climate in the classroom. The positive climate in the classroom acts to shape the relationship between teacher and pupils. It affects the results of the pupil team and uses not only education but also training. Today (current) school is oriented on the personal and social development of the pupils. It is reflected not only in good school results, but also in the complexity of pupil values. As part of the research process, the participating experts and pedagogues developed tools and criteria for the evaluation and self-assessment of the teacher's quality and the teacher's applied competencies in educational practice. These competencies were presented through case studies and the use of the implementation of the AAA evaluation methodology model. We consider it important to point out that the teacher should be a professionally qualified pedagogue who is always competent to educate and train. The essential condition for his further qualification growth is, at the same time, focused on attention and his own self-improvement. [For the complete volume, "NORDSCI International Conference Proceedings (Online, October 11-13, 2021). Book 1. Volume 4," see ED625509.]