Experiential education, outdoor training, action learning, adventure therapy, experiential learning, outdoor pedagogy, and cooperative adventure education are terms that describe a unique educational approach. Is there a difference between outdoor training and an experiential educational project? Is it a specific educational method or a variety of nature- and sports-related methods and activities that are summarized together? This book provides answers to these questions. Step by step, the terms are explained, central theories are presented, and the resulting different methodological approaches are discussed in their historical development. Using characteristics and the "Tree of Science," a clarifying system is created for theoretical and methodological understanding.