Ivan Illich argues for individual personal control over life, the tools and energy we use. A work of seminal importance. The conviviality for which noted social philosopher Ivan Illich is arguing is one in which the individual's personal energies are under direct personal control and in which the use of tools is responsibly limited. A work of seminal importance, this book claims our attention for the urgency of its appeal, the stunning clarity of its logic and the overwhelmingly human note that it sounds.