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|Description={{#evt:service=youtube|id=hQE-PdeGNY0|alignment=right|urlargs=start=371|description=Nicholas Overgaard explains the topic|container=frame }} A community's [[Scientific Mosaic|mosaic]] consists of the set of all accepted [[Theory|theories]] and employed [[Method|methods]] by the community at some particular time. How do disciplinary boundaries exist within the mosaic: are they expressible as theories and/or methods? Is the statement of disciplinary boundaries a mere definition of a discipline, a description of what a discipline has been doing, or a normative prescription of what a discipline ought to do. For example, when physicists say "Physics is the study of physical processes", it's not quite clear whether this is meant as a definition, description or prescription. It can have three different meanings: