A very good resource to introduce students and trainees to the topic of SLA in such a way that it can be easily understood. This knowledge is reinforced by the activities included and the references for further research on the topic ... The authors cover and review all the main areas of knowledge of this topic in an engaging, practical way for anyone dealing with this complex matter for the first time. In short, the main strength of this book is to help learners and teachers to tackle the numerous studies and theories on this issue.