ABSTRACT
This introduction presents an overview of the key concepts covered in the subsequent chapters of this book. The book examines that the activity of teaching, which is exclusively human, requires education professionals to take part in social processes where tutors can participate in the learning that they aim to develop in others. It reviews some research, noting that the role of tutor has many variations but always meets the condition of offering learning opportunities to the person who plays it. In addition, there are numerous practices in informal education, both in face-to-face and virtual contexts, emphasizing the potential of learning by teaching. Given the importance and effectiveness of this type of learning, the book addresses these practices and draws some lessons for formal education. It outlines methodologies and experiences based on learning by teaching: practices of peer tutoring; cooperative learning methods; students who make teaching artefacts; experiences of peer assessment; and many others.
