User Modeling and User-Adapted Interaction: The Journal of Personalization Research (UMUAI) is pleased to announce that the paper A Model of Perceptual Task Effort for Bar Charts and its Role in Recognizing Intention Stephanie Elzer, Nancy Green, Sandra Carberry and James Hoffman Volume 16, Number 1 / March, 2006 http://dx.doi.org/10.1007/s11257-006-9002-9 has been elected as the winner of the 2006 James Chen Annual Award for Best Journal Article. It was selected based on nominations from journal reviewers, editorial board members, and a subsequent comparative review by an award committee chaired by Judy Kay from the University of Sydney, Australia. The UMUAI annual best paper award has been donated by the Chen family in commemoration of James R. Chen, a creative researcher in the area of user modeling and information retrieval, and twice a UMUAI author. It carries a cash prize of U.S. $1,000. UMUAI provides an interdisciplinary forum for the dissemination of new research results on interactive computer systems that can be adapted or adapt themselves to their current users, and on the role of user models in the adaptation process. More information is available from http://www.umuai.org or the publisher's website at http://www.springerlink.com/content/1573-1391/ Alfred Kobsa, Editor User Modeling and User-Adapted Interaction: The Journal of Personalization Research