• 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.
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Manuscript received 13 Nov. 2006; accepted 23 Jan. 2007; published online 15 Sept. 2008.
Recommended for acceptance by B. Bose.
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Digital Object Identifier no. 10.1109/TC.2008.173.