Following World War 1 a unique experiment in state-building took place between two closely kindred nations in Eastern Europe; an attempt to build up a composite ethnic - Czechoslovak-nation and provide it with an adequate political framework. This book gives the reader a succinct account of this experiment by means of ethnopolitical, economic and sociological analyses. The book is divided into three parts. The first, written by Jaroslav Krejci, on ethnopolitics explains the rationale of the experiment and reviews its obstacles, successes and failures, due to both internal and external causes. The second part, by the same author, contains an outline of the economic context of ethnic as well as social aspects of the development. As far as possible, the economic structure and performance of the Czech and Slovak parts of the state are given separate attention. The third part, by Pavel Machonin, is entitled `Social Metamorphoses' and covers structural changes in the Czech and Slovak societies. Changes in class structures, stratification, mobility and living standards constitute the main items for consideration. Wherever there is relevant material available, popular opinion on particular issues and electoral results are scrutinized.