Not since 1937 has a classic reference work appeared for Indo-European. This new work, however, steps forth to fill a major gap in this rapidly changing field by making full use of the recent achievements in linguistic theory. Useful as both an introductory survey and a reference for advanced students and scholars, the volume provides insight into the variations in the way Indo-European is studied while at the same time presenting a unified overview of Indo-European. The only work available which combines the historical understanding of Indo-European with a survey of its various sub-groups, this volume will be useful to a broad range of readers including students of historical linguistics and comparative philology, modern language students interested in the background on the languages they are studying, and anyone interested in the processes of language change and evolution.