We would like to take this opportunity to acknowledge the time and effort devoted by reviewers to improving the quality of published work in UMUAI. Authors often write to express their appreciation for the detailed and useful comments that we obtain for them. Only rarely we receive complaints, even when the reviews are negative. This is a tribute to the spirit in which reviewing is undertaken for this journal. It is a pleasure, therefore, to be able to pass on thanks from the Editorial Board to the following researchers who also reviewed papers for this year:

Hua Ai, David Albrecht, Rick Alterman, Erich Bruns, Jürgen Buder, Vadim Bulitko, Keith Cheverst, Xiongcai (Peter) Cai, Iván Cantador, Sun-Ki Chai, Raimund Dachselt, Pasquale De Meo, Giorgio De Michelis, Rosta Farzan, Minyu Feng, Jonathan Gemmell, Stefan Göbel, Jeremy Gow, Tom Gross, Bart J. Hengeveld, Thomas Herrmann, Andreas Holzinger, Andreas Hotho, Geert-Jan Houben, Nadeem Jamali, Jongwa Kim, Styliani Kleanthous, Bart Knijnenburg, Dominik Leiss, Bhaskar Mehta, Emerson Murphy-Hill, Spyros Panagiotakis, Kyparisia Papanikolaou, Alexandros Paramythis, Trevor Pering, Luz Quiroga, Alan Said, Mohammad Soleymani, Alexandre Spaeth, Sophie Stellmach, Ruck Thawonmas, Marko Tkalcic, David Vallet, Gerhard Weber, Stephan Weibelzahl, Dan Witzner-Hansen, Michael Yudelson, Diego Zapato-Rivera, Andreas Zimmermann.