This paper introduces a model of adaptive learning relevant to adult learners of English for academic purposes (EAP) in Australia. Adaptive learning refers to latent variables hypothesized to contribute to optimal performance in the language. The model comprises motivation, self-efficacy, language learning anxiety, language learning strategies, and oral performance. The study applies theorizing from educational psychology concerning achievement goals and self-efficacy to language learning. The paper reports on a pilot study conducted with 249 EAP learners to validate the instrumentation. The instrumentation will be used in a future study that seeks to support the proposed model of adaptive learning. (Contains 23 references.) (Author/KFT)