• R.M. Hierons is with the School of Information Systems, Computing, and Mathematics, Brunel University, Uxbridge, Middlesex, UB8 3PH, UK.
• H. Ural is with the School of Information Technology and Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
E-mail: firstname.lastname@example.org, email@example.com.
Manuscript received 13 Nov. 2006; accepted 23 Jan. 2007; published online 15 Sept. 2008.
Recommended for acceptance by B. Bose.
For information on obtaining reprints of this article, please send e-mail to: firstname.lastname@example.org, and reference IEEECS Log Number TC-0432-1106.
Digital Object Identifier no. 10.1109/TC.2008.173.