“…Such studies are moving towards developing more complex and more closely integrated basic concepts, which can no longer be unequivocally classified as representing content or process, emotional or cognitive theories. Present-day approaches imply building complex integrated models such as, e.g., the meta-theory of motivation [Ryan, 2014], while the general trend is moving on from studying specific motives to developing comprehensive theories combining internal and external motivational factors and their temporal dynamics [Brabander, Martens, 2014;Ryan, Deci, 2000;Kanfer, Ackerman, 2000;Leontiev, 1996]. The concept proposed by a leading motivation theoretician Alexei Leontiev can be considered a comprehensive or integral one.…”