Formalism in contract law has had many defenders and many critics. What courts need, however, is an account of when formalist approaches work and when they do not. This article addresses that need by developing a general theory of the rules of contract interpretation and construction—contract “exposition.” The theory distinguishes inter alia two forms of formalism. Formalities effect legal change by virtue of their form alone, and thereby obviate interpretation. Examples from contract law include “as is”, the seal and boilerplate terms. Formalities work when parties intend their legal effects, that is, when they perform juristic acts. Plain meaning rules, in distinction, function by limiting the evidence that goes into interpretation. Plain...