Wittgenstein is one of the most important and influential twentieth-century philosophers in the western tradition. In his Philosophical Investigations he undertakes a radical critique of analytical philosophy's approach to both the philosophy of language and the philosophy of mind. The Routledge Guidebook to Wittgenstein's Philosophical Investigations introduces and assesses Wittgenstein's life, the principal ideas of the Philosophical Investigations, some of the principal disputes concerning the interpretation of his work and his philosophical method. With further reading included throughout, this guidebook is essential reading for all students of philosophy, and all those wishing to get to grips with this masterpiece.