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Activity theory (AT; Russian: Теория деятельности) [1] 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 Sergei Rubinstein in the 1930s. It was later advocated for and popularized by Alexei Leont'ev.
Cultural-historical activity theory (CHAT) is a theoretical framework [1] to conceptualize and analyse the relationship between cognition (what people think and feel) and activity (what people do). [ 2 ] [ 3 ] [ 4 ] The theory was founded by L. S. Vygotsky [ 5 ] and Aleksei N. Leontiev , who were part of the cultural-historical school of ...
The activity theory of aging, also known as the implicit theory of aging, normal theory of aging, and lay theory of aging, proposes that aging occurs with more positive outcomes when adults stay active and maintain social interactions as they get older. [1] Activity theory suggests that the aging process is slowed or delayed, and quality of ...
For Leontiev, the psychological [3] of 'activity' consisted of those processes "that realize a person's actual life in the objective world by which he is surrounded, his social being in all the richness and variety of its forms" (Leontiev 1977). The core of Leontiev's work is the proposal that we can examine human processes from the perspective ...
VLE of the mixture of chloroform and methanol plus NRTL fit and extrapolation to different pressures. The non-random two-liquid model [1] (abbreviated NRTL model) is an activity coefficient model introduced by Renon and Prausnitz in 1968 that correlates the activity coefficients of a compound with its mole fractions in the liquid phase concerned.
A leading activity is conceptualized as joint, social action with adults and/or peers that is oriented toward the external world. In the course of the leading activity, children develop new mental processes and motivations, which "outgrow" their current activity and provide the basis for the transition to a new leading activity (Kozulin, Gindis, Ageyev, & Miller 2003: 7).
Activity-based costing records the costs that traditional cost accounting does not do. The overhead costs assigned to each activity comprise an activity cost pool. From a historical perspective the practices systematized by ABC were first demonstrated by Frederick W. Taylor in Principles of Scientific Management in 1911 (1911.
Auction theory is a branch of applied economics that deals with how bidders act in auctions and researches how the features of auctions incentivise predictable outcomes. Auction theory is a tool used to inform the design of real-world auctions.