* Features/Benefits o Provides a hands-on methodological guide and overview for understanding the data/results of longitudinal research in SLA/applied linguistics and for conducting one's own such studies, illustrating these methods with exemplary studies of language learning outcomes over a long term. o Original reportings of unique large-scale research studies offer the best one-stop shop for reading and understanding current quantitative longitudinal studies in language learning. o Appendices with data and pedagogical features make it useful for course use by instructors and students. * Demand/Audience o Meets the need for methodological clarity in collecting, managing/organizing, and analyzing quantitative longitudinal data on language learning by offering students and researchers of applied linguistics, testing, and education a practical guide to conducting this research along with unique exemplar studies. * Competition o The only book to focus on quantitative longitudinal data analysis specifically for an SLA/applied linguistics readership. One older book focuses on qualitative and other methods with a narrower focus, and no other book comes very close to doing what this book does.

* Features/Benefits o Provides a hands-on methodological guide and overview for understanding the data/results of longitudinal research in SLA/applied linguistics and for conducting one's own such studies, illustrating these methods with exemplary studies of language learning outcomes over a long term. o Original reportings of unique large-scale research studies offer the best one-stop shop for reading and understanding current quantitative longitudinal studies in language learning. o Appendices with data and pedagogical features make it useful for course use by instructors and students. * Demand/Audience o Meets the need for methodological clarity in collecting, managing/organizing, and analyzing quantitative longitudinal data on language learning by offering students and researchers of applied linguistics, testing, and education a practical guide to conducting this research along with unique exemplar studies. * Competition o The only book to focus on quantitative longitudinal data analysis specifically for an SLA/applied linguistics readership. One older book focuses on qualitative and other methods with a narrower focus, and no other book comes very close to doing what this book does.