Activity theory
Activity theory (AT; ) is an umbrella term for a line of eclectic social sciences theories and research with its roots in the Soviet psychological activity theory pioneered by Lev Vygotsky , Alexei Leont'ev and Sergei Rubinstein. These scholars sought to understand human activities as systemic and socially situated phenomena and to go beyond paradigms of reflexology (the teaching of Vladimir Bekhterev and his followers) and classical conditioning (the teaching of Ivan Pavlov and his school), psychoanalysis and behaviorism. It became one of the major psychological approaches in the former USSR, being widely used in both theoretical and applied psychology, and in education, professional training, ergonomics, social psychology and work psychology.
Activity theory
Some changes were introduced, apparently by importing notions from human–computer interaction theory. For instance, the notion of "rules", which is not found in Leont'ev, was introduced. Also, the notion of collective subject was introduced in the 1970s and 1980s (Leont'ev refers to "joint labour activity", but only has individuals, not groups, as activity subjects).