Dr Lydia C A M Bossers1, Dr Richard Paul2. 1. Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, UK. Electronic address: lydia.bossers@southwales.ac.uk. 2. Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, UK. Electronic address: richard.paul@southwales.ac.uk.