Archaeology is a method for analyzing the conditions that make a body of knowledge possible in a given historical period, without treating those conditions as steps in a story of progress.
Michel Foucault introduced the method in The Order of Things (1966) and formalized it in The Archaeology of Knowledge (1969). Where a conventional history of ideas traces how one thinker influenced another, archaeology asks a different question: what rules of formation had to be in place for these statements to appear at all? The unit of analysis is not the author’s intention or the text’s meaning but the statement — the basic function by which something enters discourse as sayable.
Archaeology proceeds by identifying discontinuities. Foucault argued that the transition from Renaissance to Classical to Modern knowledge was not gradual refinement but a series of breaks in which the rules governing what counted as knowledge changed at a deep structural level. The Classical naturalist and the modern biologist are not doing the same thing more or less well; they operate within different epistemes — different configurations of what can be ordered, classified, and known.
The method is deliberately anti-teleological: it refuses to read the past as leading toward the present. This sets it apart from genealogy, which Foucault developed later. Where archaeology maps the synchronic rules of a discourse at a moment, genealogy traces the diachronic forces — power, accident, institutional struggle — that produce and destabilize those rules over time. The two methods are complementary, not competing.