The overarching goal of this volume is to explore a number of recent developments in Phase Theory (both theoretical and empirical), thus contributing to our overall understanding of the concept of phases. The volume is divided into three parts, of which the first focuses on the traditional role played by phases in defining successive cyclicity, while at the same time examining the interaction between that traditional role and Chomsky (2013)’s proposal about labeling. The second part focuses on the question of whether only the highest projection of the clausal and nominal domain, CP and DP,...