Part of the description of discursive practices, for Foucault, must include the effects of discourse in society and the means by which those effects are brought to bear, through teaching, in the formation of laws, or in the creation of disciplines. In The Archaeology of Knowledge, Foucault admits that describing the effects of discourse is the most difficult aspect of discursive formations, and in later books he takes up the idea under the rubric of "power," through which he questions the relation of discourse to objects of observation, judgment, analysis, legal control, physical control, naming, management, regulation, and modification.