The present volume aims at exploring the overall patterns of linguistic regionalism throughout Eastern Europe, casting also a comparative glance beyond this specific cultural setting into neighboring Western European regions. A wide array of aspects related to regional language designs are addressed, such as: linguistic rights, conflicting conceptualisations of linguistic regionalism, the role of the internet in identity modelling, the role of linguistics in language planning and research, etc. The volume is also designed to approach linguistic regionalism on a general theoretical level giving a critical assessment of Aleksandr Dulichenko's microlanguage paradigm. Case studies of individual projects as well as reports by regional language activist will provide the reader with glimpses of how regional language designs are set up and elaborated.