John Hospers' Introduction to Philosophical Analysis has sold over 150,000 copies since its first publication. This new edition ensures that its success will continue into the twenty-first century. It remains the most accessible and authoritative introduction to philosophy available using the full power of the problem-based approach to the area to ensure that philosophy is not simply taught to students but practised by them. The most significant change to this edition is to respond to criticisms regarding the omission in the third edition of the famous opening chapter. A brand new chapter, Words and the World, replaces this in the fourth edition - which now features a large number of examples and illustrative dialogues. The rest of the text has been thoroughly revised and updated to take account of recent developments in some areas of philosophy.