0 Final_Preface_Mu IJAHP Editorial: Mu, E. / Words from the Editor-in-Chief International Journal of the Analytic Hierarchy Process 1 Vol. 4 Issue 1 2012 ISSN 1936-6744 June 2012 Dear IJAHP Readers: We are quite happy to enter our fourth year of publication and we start our fourth volume with a special issue on “AHP/ANP Multicriteria Decision Making for Sustainable Development.” I will let our guest editor, Dr. Fabio DeFelice of the University of Cassino in Italy, introduce the special issue himself; however, I would like to indicate that this special issue would not have been possible without the efforts of Dr. Antonella Petrillo, also of the University of Cassino, who became the point person for the collection and follow up of the different papers. Also, this special issue required an extraordinary effort of a great number of anonymous reviewers who contributed with their time and expertise to review and improve the papers. Finally, and as usual, Rozann Saaty, IJAHP managing editor, was key to getting all the papers ready for publication. Now I will let Fabio DeFelice introduce this special issue. Enrique Mu, PhD IJAHP, Editor-in-Chief Rob Typewritten Text http://dx.doi.org/10.13033/ijahp.v4i1.146 Rob Typewritten Text