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Abstract
The articles in this special issue make valuable contributions toward a scientific understanding of concepts that is broader than the traditional view that has focused on categorizing by individuals. I propose considering concepts for categorization as a special case of concepts. At their clearest, they can be referred to as formal concepts, or concepts used formally,which have explicit definitions and are used in formal deductive reasoning and argumentation. A label for broader aggregations of concepts is functional concepts, or concepts used functionally. This distinction is nearly parallel to CitationVygotsky's (1934/1987) distinction between scientific concepts and everyday concepts. Formal (uses of) concepts are important products and resources in subject matter disciplines, especially in science and mathematics. I suggest that the distinction between formal and functional (uses of) concepts can support a useful interpretation and organizing frame for efforts to provide meaningful instruction in disciplinary domains.