This much-needed volume presents key research and practical applications for addressing the challenges and reaping the rewards of mixed classes. Written by specialists from different educational levels, language backgrounds, and geographical locations, this is a must-read for current and future language teachers. * Maria M. Carreira, Professor Emerita, California State University, Long Beach, USA * More than an anthology, this volume is a masterful resource for teachers, scholars, and administrators faced with a mix of heritage and second-language speakers in the same learning environment. The contributions, ranging from theory to praxis, provide a first-ever handbook for navigating the social and linguistic complexities of multilingual classrooms. * John Lipski, Pennsylvania State University, USA * Heritage speakers cannot always be in separate language tracks; this volume gathers a range of theory and tools that will help teachers best meet students needs in mixed classrooms. Notably, it includes critical language awareness as well as a range of age contexts and world locations. Particularly useful are the concrete recommendations for practice and for department-wide workshops. A timely and important collection. * Kim Potowski, University of Illinois at Chicago, USA * Second Language and Heritage Learners in Mixed Classrooms contributes to the scarce literature on the complex issue of teaching language in mixed classrooms with learners with very different types of knowledge, motivation and needs [ ...] the volume will certainly offer both a strong theoretical background, and inspiration and ideas for practical classroom implementation. * Amąlia Llombart-Huesca, California State Polytechnic University Pomona, USA, Hispania, Volume 106, Number 3, September 2023 *