Kozulin (1990) indicates that Vygotsky's primary objective ‘was to identify specifically human aspects of behavior
and cognition’ (p. 4) via genetic analysis methodology. He focused on several different domains of development:
human evolution (phylogenesis), development of human cultures (sociocultural history), individual development
(ontogenesis) and development which occurs during the course of a learning session or activity or very rapid change in
one psychological function (microgenesis) (Wertsch, 1991).