This volume contains detailed information on the law on 'informal relationships' in 28 European jurisdictions. An informal relationship refers to a relationship that is not formalised as a marriage or as a registered partnership/civil union between a couple. The expert members of the CEFL have drafted national reports on the basis of a detailed questionnaire. This book integrates all the responses in order to provide an overview and a straightforward simultaneous comparison of the different solutions chosen within national systems. On the basis of this reliable and comprehensive comparative material the CEFL will be able to draft Principles of European Family Law on Informal Relationships.