This is a much revised and extended new edition of Part I of the first volume of the monumental four-volume Analytical Commentary on the Philosophical Investigations.

• Takes into account much new material that was unavailable when the first edition was written
• Following Baker’s death in 2002, P.M.S. Hacker has rewritten many essays completely
• Part I: Essays now includes two completely new essays: 'Meaning and Use' and 'The Recantation of a Metaphysician'; the essays: ‘The Augustinian Conception of Language’, ‘The Language-Game Method’, ‘Contextual Dicta and Contextual Principles’, ‘Philosophy’, ‘Surveyability and Surveyable Representations’, and ‘Truth and the General Propositional Form’ are redrafted and expanded, incorporating new source materials and new arguments, as well as taking into account debates of the last quarter of a century
• The accompanying Part II:  Exegesis §§1-184 - has been thoroughly revised in the light of the electronic publication of Wittgenstein’s Nachlass, and includes many new interpretations of the remarks, a history of the composition of the Philosophical Investigations and an overview of its structure.
• The revisions will ensure that this remains the definitive reference work on Wittgenstein’s masterpiece for the foreseeable future

G.P.Baker was a Fellow of St John’s College, Oxford from 1967 until his death in 2002. He is the co-author with P.M.S. Hacker of the first two volumes of the four-volume Analytical Commentary on the Philosophical Investigations (Blackwell, 1980–96), author of Wittgenstein, Frege and the Vienna Circle (Blackwell, 1988) and with Katherine Morris of Descartes’ Dualism (1996). He also wrote numerous articles on Wittgenstein, Frege, Russell, Waismann and Descartes.

P.M.S. Hacker is the leading authority on the philosophy of Wittgenstein. He is author of the four-volume Analytical Commentary on the Philosophical Investigations, the first two volumes co-authored with G.P. Baker (Blackwell, 1980–96) and of Wittgenstein’s Place in Twentieth-century Analytic Philosophy (Blackwell, 1996). His other previous works include The Philosophical Foundations of Neuroscience (Blackwell, 2003) and History of Cognitive Neuroscience (Wiley-Blackwell, 2008), both co-authored with M.R. Bennett. Most recently he has published Human Nature: The Categorical Framework (Blackwell, 2007), the first volume of a trilogy on human nature.Together with Joachim Schulte, he has produced the 4^th edition and extensively revised translation of Wittgenstein’s Philosophical Investigations (Wiley-Blackwell, forthcoming 2009).