Research on second language acquisition focuses on the L2 acquisition of Estonian, and the effects of language teaching and sociolinguistic factors on language acquisition. The focus of research in the Institute is on how learners of Estonian with diverse language backgrounds acquire Estonian and how language proficiency develops over time. We investigate the interaction of learners’ attitudes, motivation and language policy regulation in the development of language skills. Teaching methods are developed to support learners of Estonian, and e-learning is also under investigation.