The purpose of the study was to explore three characteristic features of the East European educational services market. The study was carried out since December 2018 till January 2020. The following research methods were used in the work: empirical methods, methods of theoretical analysis and methods of social statistics. The results have a few significant implications for science and practice. For the first time three characteristic features of the East European educational services market were explored in the study: 1. The first characteristic feature of the East European educational services market is lack of strong research on higher education challenges. 2. The second characteristic feature of the East European educational services market is lack of the definition of "educational services" in the legislation of East European countries. 3. The third characteristic feature of the East European educational services market is weakness. The results are highly statistically significant (0.01). In this sense, the decision-making process is with accurate, controlled probability. Hence, some recommendations for the Governments of East European countries were generated: The governments should provide funding for research on the educational services market, and the governments should add the definition "educational services" to the normative legal acts.

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The goal of the study was verification of the hypothesis: students of East European universities are subjects of educational services. The study was carried out since December 2018 till December 2019. The following research methods were used in the work: empirical methods (the study of normative legal acts and scientific-methodological literature; content analysis of scientific sources and standards for higher professional education; monitoring of publications); methods of theoretical analysis (comparative and retrospective one; specification and generalization; classification; induction and deduction); mathematical and graphical methods for data analysis of research, verification of statistical hypotheses. The legal relations between the subjects of educational services in some East European countries have been studied. The results have a very important scientific and practical significance: 1. It is statistically proven that students of East European universities are not subjects of educational services. The result is highly statistically significant (0.01). 2. There were given recommendations for Governments of East European countries. 3. There were given recommendations for the authorities of East European universities.

The purpose of the review was to show four levels of organization of educational activity of educational service providers. The review was carried out since January 2020 till May 2020. Above 200 publications have been explored, including in journals indexed in databases SCOPUS and Web of Science. There were following research methods used in the review: (1) methods of theoretical analysis (induction and deduction; comparative and retrospective analysis; classification; specification and generalization); (2) empirical methods (study scientific papers and normative legal acts; content analysis of relevant sources); (3) mathematical and graphical methods for data analysis of research, verification of statistical hypotheses. The results of the review have a few significant implications for science and practice. Three theoretical directions were explored: 1. psychological sciences; 2. learning theory; 3. investment in higher education. For the first time it was shown four levels of organization of educational activity of educational service providers. The recommendations were generated for each of four levels. Some results are statistically significant (0.05).

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