Parallel framework agreements are a practical phenomenon, but not regulated in legal rules. This book provides a well-structured analysis of potential restrictions and their use by examining various EU legal principles. It is a comprehensive analysis on a gap in EU public procurement law and the book is an important addition to the literature, which is almost non existing on the topic, despite its relevance in practice. -- Carina Risvig Hamer, University of Copenhagen, Denmark This book provides insightful analysis of the messy issues arising where parallel framework agreements are available to a contracting authority. It explores limits, tensions and trade-offs between flexibility and legal certainty. It is a valuable, timely reference as EU procurement rules undergo a revision meant to increase their flexibility. -- Albert Sanchez-Graells, University of Bristol Law School, UK