Logosynthesis™ is an innovative and comprehensive system for personal development. It is effective in coaching, counselling and psychotherapy, and can also be used as a self-help tool. It enables people to find their innermost life path. Logosynthesis is simple, elegant, effective, and easily conveyed. The system contains a model, principles for change and actual interventions, embedded in a holistic view of human nature. Logosynthesis has been derived from the principles of many schools of change. Specialists from different schools of thought will detect features of their models in logosynthesis. However, the combination of effective principles in logosynthesis is new and unique. Willem Lammers first introduced the concept in 2005, and since then it has been expanded continuously. This article describes the model, the method and the training system. The key concepts of logosynthesis are: