According to g. a possible solution to the "traveling problem" in comparative politics is to identify broader concepts. he argued that there are two dimensions to this process. a central element in the study of categories is the distinction between the extension and intension of a category. the extension (denotation) of a category is the set of entities in the world to which it refers. the intension (connotation) is the set of meanings or attributes that define the category and determine membership.