Pragmatics has two roles in SLA: It acts as a constraint on linguistic forms and their acquisition, and it represents a type of communicative knowledge and object of L2 learning in its own right. The first role of pragmatics is evident in functionalist (Tomlin 1990) and interactionist (Long 1996) views of SLA. The second role puts pragmatics on a par with morphosyntax, lexis, and phonology in that inquiry focuses on learners' knowledge, use, and acquisition of L2 pragmatics. It is the latter sense of “pragmatics and SLA” that is the focus of this paper. In analogy with other areas of specialization within SLA—interlanguage syntax, interlanguage lexis, and so forth—the study of nonnative speakers' use and acquisition of L2 pragmatic knowledge is referred to as interlanguage pragmatics.