The objective of this paper is to present the results of the study detailing the essence of the "gratefulness" phenomenon as a quintessence of morality in the context of today's world and its values. The methods of the research were theoretical analysis of the works of philosophers, psychologists, philologists, and pedagogues on the structure and essence of the notion "gratefulness" as well as the method of diagnostic experiment. A review of various treatments of gratefulness is suggested, ranging from the "feeling", "capacity", "attitude", "concept" to "indicator", "prerequisite", "limiter", "virtue", "duty", "obligation" and so on. An attempt is made to characterize "gratefulness" through description of its components and indices of its formation and a portrait of an adolescent having a high level of its formation is given. A complex of author's diagnostic techniques (in the forms of questionnaire, ranking, essay) worked out on the basis of the theoretical analysis and the current condition of gratefulness formation in adolescents from various types of schools is described. A comparative analysis of gratefulness formation in those schoolchildren who have development disorders and in normally developing ones is given

Apresyan, R.G. (1995).  The idea of morality and basic legal and ethical programs. Moscow: IFRAN, 353 p.

Benjamin, R. (2012). The new limits of education policy. New York: Edward Elgar, 370 p.

Berdnikova, A.G.  (2005). Speech genre of gratefulness: cognitive and semantic and pragmatic aspect: PhD Thesis. Novosibirsk, 224 p.

Cicero, M.T. (1985).  Philosophical treatise. Moscow: Science, 382 p.

Development strategy of upbringing in the Russian Federation until 2025 (2015). Direct access: https://rg.ru/2015/06/08/vospitanie-dok.html

Dictionary in ethics (1983). Moscow: Publishing House of Political Literature, 2800 p.

Douglas, B.H. (2000). Communicative competence. Cambridge: Cambridge University Press, 10-13.

Durkheim, E. (2011). Moral Education: A Study in the Theory and Application of the Sociology of Education. Whitefish: Literary Licensins, 320 p.

Efremova, T.F. (2000). New Dictionary of the Russian language. Moscow: Russian language, 1209 p.

Emmons, R.A. (2013). Gratitude Works: A 21-Day Program for Creating Emotional Prosperity. California: Publisher-Jossey-Bass, 196 p.

Emmons, R.A. (2016). The New Science of Gratitude.  Direct access: http://www.gratitudepower.net

Foskett, N. & Lumby, J. (2003). Leading and Managing Education. Direct access: http://mie.sagepub.com/content/17/3/24.extract

Kant, I. (1994). Collected Works in eight volumes. Moscow: CHORO, 132 p

Kataeva, N.A. (2012). Figuratively-perceptive component of gratefulness in Kalmyk, Russian and English linguoculture. Proceedings of the Volgograd State Pedagogical University. Series Philological sciences, 2(66), 46-49.

Kincheloe, J. (2002). Teachers as researchers. London: Rutledge Falmer, 355 p.

Klein, M.  (1997). Envy and gratitude. St. Petersburg: Peter, 100 p.

Klyuchevsky, V.O. (1968). Letters. Diaries. Aphorisms and thoughts about history. Moscow: Science, 528 p.

Kon, I.S. (1984). Finding oneself. Personality and its identity. Moscow: Politissue, 335 p.

Neckerman, K.M. (2007). Schools Betrayed. Roots of Failue in Inner-City Education. London: Rutledge, 328 p.

Osho, R. (2016). Proverbs from Osho Direct access: http://millionstatusov.ru/aut/osho/t/blagodar-nost.html

Ozhegov, S.I. & Shvedova, N.Yu. (2015). Explanatory Dictionary of the Russian language: 80 000 words and frazeological expressions. Moscow: LLC “A Temp”, 886 p.

Peterson, R.Z. (1992). The Core Curriculum in Professional Psychology. Washington: American Psychological Association, 289 p.

Seneca, L.A. (1977). Moral letters to Lutsiliy. Moscow: Science, 62-65.

Volodina, L.O. (2011). Spiritual and moral values of education in the Russian family. Pedagogy, 4, 41-50.

Yamburg, E.A. (2007). Aristocracy as a criterion of the quality of education. Head teacher. Managing a modern school, 6, 16-40.