Radical constructivism is a theory of knowing that provides a pragmatic approach to questions about reality, truth, language and human understanding. It introduces a change to many basic ideas, and consequently has a profound influence on the general attitude towards the world we experience. By generating awareness of the thinker's active role in building up concepts, the new orientation liberates the individual from spurious tethers and shows that it is ultimately ourselves who are responsible for what we think and do. To educators, the book suggests that the most important task is not to convey ready-made knowledge but to teach the art of constructing it.