1. ALGORITMI Research Centre; University of Minho; Braga Portugal
2. ISTAR-IUL; Instituto Universitário de Lisboa (ISCTE-IUL); Lisbon Portugal
3. CIS-IUL; Instituto Universitário de Lisboa (ISCTE-IUL); Lisbon Portugal
4. NOVA Information Management School (NOVA IMS); Universidade Nova de Lisboa; Lisbon Portugal
5. School of Computing and Communications; The Open University; Milton Keynes UK