The presentation of the first part of the book on the application of the European Directive on Energy Performance of Buildings (EPBD) was held on 2 February 2016 in Brussels. This book is the fourth in a series of publications, which started in 2008, and highlights the significant developments noted in the implementation of the Directive in the 2012-2015 period. The first part of the book describes the accomplishments and challenges that still exist in the most significant issues related to the EPBD application in Europe, as well as the conclusions drawn and the recommendations suggested for the next assessment concerning the 2016-2017 period. Sympraxis Team was fully in charge of the edition’s language editing and production, in the framework of the communication support provided to the Concerted Action EPBD.