"The author has done an excellent job in covering with scope and depth of the acquistion of tense and aspect in second language learning and can be said to have achieved the three goals identified at the beginning of the book, namely surveying the field, explicating methodological issues, and providing a synthesis." Applied Linguistics "Bardovi-Harlig's substantial volume, bringing together over two decades of research, is a model of thoroughness, informative research synthesis and readability. Aimed primarily at the research community, this comprehensive yet accessible treatment of an important area of second language acquisition research will also be of interest to second/foreign language curriculum developers and teachers." The Canadian Modern Language Review "This book is certain to have a major influence on this very active field of inquiry. There is NO book or any other publication that brings together between two covers the diverse studies that have been done on second language acquisition of tense and aspect. And Bardovi-Harlig does an excellent job of providing a comprehensive unified presentation of such diverse research." Professor Roger Andersen of UCLA. "The review is comprehensive, accurate and highly readable. Particularly important for the field is its contribution in bringing together different areas of L2 tense-aspect research in one accessible monograph, which presents a comprehensive picture of how L2 learners acquire temporality. I do not know of any other area of SLA where the total picture of acquisition has been described so comprehensively. The monograph will be a landmark in SLA research." Professor Yasuhiro Shirai of Cornell University.