The book consists of 12 essays on the following Vietnam & the resistance; the war on poverty; Latin America, Puerto Rico & immigration to the US mainland; Catholic Church problems; the Church's role in social change & development; the futility of schooling; the question of technical assistance & programs for 3rd world birth control. Each issue, while real & urgent in its own right, becomes a paradigm case which reveals a fundamental theoria/praxis of revolution, informed by a philosophical & theological discipline & sensibility which transcends, tho it cannot avoid, concrete issues in a given time & place. In each essay, Illich uses the method of radical doubt--not in a Cartesian but in a Socratic sense. He challenges the 'nature of some certainty' purveyed as truth.