In this review of Christopher Winch's new book, "Education, Autonomy and Critical Thinking" (2006), I discuss its main theses, supporting some and criticising others. In particular, I take issue with several of Winch's claims and arguments concerning critical thinking and rationality, and deplore his reliance on what I suggest are problematic strains of the later Wittgenstein. But these criticisms are not such as to upend Winch's powerful critique of antiperfectionism and "strong autonomy" or his defence of "weak autonomy." His account of autonomy as an educational aim is important and in several respects compelling.