Robert Pater, (Email)1, 2, Maciej Beręsewicz, (Email) 3, Łukasz Cywiński, (Email) 1
1 University of Information Technology and Management, Rzeszów, Poland, 2 Educational Research Institute, Warsaw, Poland, 3 Pozna? University of Economics and Business, Pozna?, Poland
Mina Gerges, (Email)1, 2, El-sayed M. El-Horbaty, (Email) 2
1 CAPMAS, National Statistics Office of Egypt, Cairo, Egypt, 2 Faculty of Computer and Information Sciences, Ain Shams University, Cairo 11566, Egypt, Cairo, Egypt