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It is discussed through four scientific disciplines: computer science, biology, economics, and epistemology. The definition of activity usually used in simulation is extended to new qualitative and quantitative definitions. In computer science, biology and economics disciplines, the new simulation activity definition is first applied critically. Then, activity is discussed generally. In epistemology, activity is discussed, in a prospective way, as a possible framework in models of human beliefs and knowledge.<\/jats:p>","DOI":"10.1177\/0037549712457852","type":"journal-article","created":{"date-parts":[[2012,10,23]],"date-time":"2012-10-23T20:29:55Z","timestamp":1351024195000},"page":"156-177","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":12,"title":["Refounding of the activity concept? 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