"The Big Brother Effect" is a non-fiction book that explores student motivation in the educational context. It highlights the challenges teachers face in fostering their students' motivation, particularly during adolescence. The book is based on a comprehensive analysis that examines the effectiveness of a peer tutoring program aimed at counteracting declining motivation. By combining various research methods, including questionnaires, observations, and interviews, it demonstrates how the tutoring system can positively influence the learning of the German language. The results suggest that students value support from their peers and that this form of collaboration has improved their performance and attitudes towards the language. Thus, the book provides valuable insights for educators seeking effective strategies to enhance student motivation and optimize their learning processes.