Wittgenstein's Philosophical Investigations is arguably one of the most influential books of the 20th century. It threw a new light on the workings of language and mind, contributing significantly to the understanding of human knowledge. Featuring essays by internationally renowned scholars, this book explores the development of Wittgenstein's ideas in the direction of the Investigations. It offers a comprehensive view of some of the most disputable issues in the study of Wittgenstein's masterpiece and reassesses its relevance within contemporary philosophical debate. Contributors: Alberto Arruda (New University of Lisbon), João Vergílio Gallerani Cuter (University of S. Paulo), P. M. S. Hacker (University of Oxford), Nathan Hauthaler (University of London), Emiliano La Licata (University of Palermo), Constantine Sandis (Oxford Brookes University), Nikolay Milkov (University of Paderborn), Maria Filomena Molder (New University of Lisbon), Jesús Padilla Gálvez (University of Castilla-La Mancha, Toledo) and Rui Sampaio da Silva (University of the Azores).