This commentary discusses Westergaard's (2021) keynote article, which presents a comprehensive model of first language (L1), second language (L2), and third language (L3) acquisition. The commentary presents evidence from a previous study of L3 learners that provides support for Westergaard's property-by-property transfer proposal. The commentary…

This paper presents the author's response to Xiaoming Xi's article titled "How do we go about investigating test fairness?" In this response, the author focuses on test fairness and Toulmin's model of argument structure, Xi's proposal, and the challenges the proposal brings. Xi proposes an approach to investigating test fairness to guide…

Despite the lack of empirical evidence, the term "foreign language learning disability" (FLLD) has become popular in the learning disabilities (LD) and foreign language literature. I contend that there is not a unique "disability" for foreign language learning and suggest instead that foreign language skills run along a continuum of very strong to…

Systems for classifying speakers' communicative intents are typically limited in scope, in applicability across the full developmental range of language abilities and disabilities, and in their theoretical foundations. Criteria for an adequate system for analyzing communicative intents are discussed, and a system is proposed which meets those…