1. Research Fellow, Salford Centre for Research and Innovation, Univ. of Salford, Salford M5 4WT, U.K.
2. Professor, School of Computing, Science and Engineering, Univ. of Salford, Salford M5 4WT, U.K. (corresponding author). E-mail: y.rezgui@salford.ac.uk
3. Professor, School of Computing, Science and Engineering, Univ. of Salford, Salford M5 4WT, U.K.