activity theory

Noun

 * 1) A line of eclectic social science theories and research with its roots in a Soviet theory pioneered by Sergei Rubinstein in the 1930s, seeking to understand human activities as systemic and socially situated phenomena and to go beyond paradigms of reflexology and classical conditioning.
 * 2)  The theory that the human ageing process is delayed, and the quality of life enhanced, in people who stay active and maintain social interactions.