IJAHP PREFACE: Mu/Words from the Editor-in-Chief of the IJAHP  International Journal of the Analytic Hierarchy Process Vol. 3, Issue 1, 2011 ISSN 1936-6744   Dear IJAHP Reader: This issue marks the beginning of our third year as a journal and we are glad to report our progress is solid and strong. The articles in this issue have a theoretical blend. Von Solms’s discussion of AHP/ANP validity opens the issue followed by articles dealing with the use of ANP in modeling problem situations, discussion of an AHP/ANP approach to stability measurement, a survey of methods to make transitive multiple comparison matrices, and an interpretation of AHP synthesis as the eigensolution of an ANP supermatrix. In addition, Dr. Saaty discusses, in our essay section, a common—but wrong—objection to the AHP method when measuring tangibles. We are also adding a News section in this issue for AHP-related news and events that may be of interest to our IJAHP readers. Enjoy the Issue! Enrique Mu, PhD Editor-in-Chief   Rob Typewritten Text http://dx.doi.org/10.13033/ijahp.v3i1.89