The number of areas of chemistry where the application of simple group theoretical ideas is important for undergraduate and post-graduate students has greatly increased over recent years. This book, written as part of the MacMillan Physical Science Series, covers the essential group theory encountered in under-graduate and postgraduate chemistry courses, with the emphasis throughout on the application of theory. The aim has been to include a wide range of examples without unnecessarily increasing the level of difficulty for the reader. Only a very modest mathematical background is needed to be able to use this book, although an elementary knowledge of quantum mechanics and bonding theory would be helpful.