Second Language Acquisition (SLA) is a theoretical and experimental field of study which looks at the phenomenon of the acquisition of second languages. Understanding Second Language Acquisition provides an approachable but authoritative introduction to this area of linguistics. The basics are carefully explained and there are pointers for further study. In this book, the author concentrates on the essential notions involved rather than argue for a particular theoretical position. The book has broad appeal as it offers a balanced treatment of the linguistic, social, psychological and educational dimensions of SLA research. It will be illustrated with examples of English and other languages. This is the ideal book for both beginning students of Applied Linguistics, or anyone in a related discipline looking for a first introduction to second language learning.