Philosophical interest in the writings of Ludwig Wittgenstein is developing at a phenomenal rate. Every year sees a growing number of works devoted to matters pertaining to exegesis or application of Wittgenstein's ideas. Wittgenstein's influence is thus radiating throughout every branch and community of philosophical research.Printed here are over one hundred of the most important and interesting papers dealing with Wittgenstein's writings that have been published, together with a comprehensive bibliography of Wittgenstein's work and the vast corpus of secondary sources currently available. The primary aim here has been to reprint those articles which have played a predominant role in the interpretation of Wittgenstein's thought and which have themselves stimulated a considerable amount of philosophical discussion or interest in Wittgenstein's work. This collection provides a valuable indication of the manner in which Wittgenstein's work was initially received and the direction in which Wittgenstein's criticism and philosophy has consequently evolved.The work of several international figures is presented here for the first time in English. Finally, the collection contains an exhaustive bibliography of the major articles and books that have been so far published on Wittgenstein.