This article traces the intellectual roots and developments of the notion of competence in second language (L2) teaching and research. Since L2 teaching and research invariably concern competence of some sort (linguistic, communicative, interactional, or otherwise), there have been countless attempts to define competence from diverse theoretical…

This dissertation presents a series of case studies concerned with whether the signal in a given set of measurements that we take in the course of linguistic inquiry reflects grammatical competence or performance factors. We know that performance and competence do not always covary, yet it is not uncommon to assume that measurements that we take…