Schematism is proposed as part of an epistemological framework for constructing and employing scientific knowledge. Within this framework, it is proposed that a concept of physics can be explicitly defined in a scientific theory by a schema that includes: (1) the domain of the concept; (2) its organization, i.e., the relationships between this particular concept and other concepts; (3) it quantification, i.e. its measurement according to well-defined laws and rules; (4) its expression, i.e., the set of words, depictions and mathematical representations denoting it; and (5) its employment, i.e., the ways it can be used to deal with physical situations that belong to its domain, and to construct and employ scientific knowledge. The schematic structure of the concept of force is presented for illustration, and results of its application in training two groups of Lebanese students are outlined. Contains 46 references. (Author)