 Foucault left instructions that there should be no posthumous publication of his writings that he had not published in his lifetime. But Foucault had allowed taping of his lectures, and his estate decided that this amounted to permission to publish edited versions of his public lectures based on his notes and tape recordings. This decision has allowed print editions of the annual courses of lectures that he delivered at the Collège de France from 1970–71 through 1983–84 (except for a sabbatical year in 1976–77) as well as other lectures he gave in different universities around the world. This has made an enormous body of important material available. Some of it covers work later published, but some presents ideas that appear nowhere else.