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.
Collaboration
Game theory is a branch of applied mathematics, computer science, and economics that looks at situations where multiple players make decisions in an attempt to maximize their returns. The first documented discussion of game theory is in a letter written by James Waldegrave, 1st Earl Waldegrave in 1713. Antoine Augustin Cournot's "Researches into the Mathematical Principles of the Theory of Wealth" in 1838 provided the first general theory. In 1928 it became a recognized field when John von Neumann published a series of papers. Von Neumann's work in game theory culminated in the 1944 book The "Theory of Games and Economic Behavior" by von Neumann and Oskar Morgenstern.