With great pleasure we give readers "Working Time and Its Organization In New Member States of EU. Economic, legal and social aspects". This book presents opinions and knowledge of numerous foreign and Polish experts on the vital problem of working time organization, flexible forms it takes, and its effects in the context of both private and social life. "Working Time and Its Organization In New Member States of EU. Economic, legal and social aspects" is a proof that flexible working time is an important issue not only in Poland, but in other countries of Western and Mid-Eastern Europe as well. The idea of new forms of working time organisation became popular during the last two decades, though it was not absent in earlier literature and research - it was investigated by the Institute of Labour and Social Studies. Due to socio-economical changes, progress of civilisation, technology and globalization, the perception of some aspects of flexible working time organisation has changed and new terms have been coined (flexi time management, work-life balance). But this issue is a part of the working time and work -and family problem group which was analysed by the Institute in the wide context of social, economical, organisational and legal issues The other subject of this theme group was, and still is, the research of working time, its legal norms and arranged forms, and the shortening of working time. The Institute has always paid a special attention to the analyses and empirical research of variable working time. Gradually, flexi time management came into prominence among the Institute's researches. It became examined not only in the social context, but its economical and legal aspect was investigated as well . Another group of vital research topics investigated by the Institute of Labour and Social Studies in the last ten years was related to the work-life balance. Currently, the countries of Mid-Eastern Europe which were recently accepted as member states of European Union are the focus of the Institutes' studies. The results of this research are included in the publication we present. We hope that this book will enhance the knowledge of working time issues, as studied in the economical, legal and social context.