The E-Learning Compendium serves as a manual for anyone involved in the design, development, and evaluation of E-Learning in schools, universities, and vocational training. It can also be used as a textbook for students in educational science, psychology, media studies, business administration, and computer science. It covers all decision-making levels in the design and development of computer- and web-based learning environments, from needs analysis to usability studies and field evaluations. The approach is based on current findings and theories in teaching and learning psychology.