In this paper we describe an experiment in explicit instruction that compares traditional form-focused instruction and what we call processing instruction. Traditional instruction involves explanation and output practice of a grammatical point. Processing instruction involves explanation and practice/experience processing input data, taking learner strategies in input processing as the starting point for determining what explicit instruction should look like. Pretest and posttest measures involving both a sentence-level interpretation (comprehension) task and a sentence-level production task were submitted to an analysis of variance. Results reveal significant gains in both comprehension and production for subjects who experienced processing instruction. For those experiencing traditional instruction, significant gains were made in production only.

Examining the role of instruction in second language acquisition (SLA) entails not only a specification of what aspects of SLA stand to be affected but also a clear conception of what is meant by instruction. In this paper the potential of various instructional strategies for promoting SLA among child second language (L2) learners is considered in relation to empirical findings in early French immersion programs. Several principles are proposed concerning the what, when, and how of code-focused L2 instruction in a communicatively oriented school-based acquisition context. These proposals need to be put to the test in further experimental research.