The Annual Review of Language Acquisition (ARLA) is devoted to research in the domain of first language acquisition, i.e., the process of acquiring command of a first language. It focuses on research that has been reported in recently defended PhD theses. The contributions in ARLA consist of edited summaries or excerpts from dissertations addressing issues in first language acquisition. These contributions are written by the original author of the dissertation and conform to the format of a journal article. ARLA publishes reports of original research pertaining to various approaches to first language acquisition: experimental, computational, clinical or theoretical.Contributions by:Jill G.de Villiers;Mitsuhiko Ota;Joan Sawyer;Marja van Helden-Lankhaar.