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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.
[1] [2] [3] Spreadsheets were developed as computerized analogs of paper accounting worksheets. [4] The program operates on data entered in cells of a table. Each cell may contain either numeric or text data, or the results of formulas that automatically calculate and display a value based on the contents of other cells.
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The activity theory and the disengagement theory were the two major theories that outlined successful aging in the early 1960s. [4] The theory was developed by Robert J. Havighurst in 1961. [ 1 ] In 1964, Bernice Neugarten asserted that satisfaction in old age depended on active maintenance of personal relationships and endeavors.
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 ...
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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 ...
In spreadsheet programs like the open source LibreOffice Calc or Microsoft's Excel, a single document is known as a 'workbook' and may have by default three arrays or 'worksheets'. One advantage of such programs is that they can contain formulae so that if one cell value is changed, the entire document is automatically updated, based on those ...