1. Department of C. S. E., KHIT, JNTUK, Kakinada 522019, India
2. Department of C. S. E., V. R. Siddhartha Engineering College, Vijayawada 520007, India
3. Department of Computer Science, Coal City University, Enugu 400231, Nigeria
4. Department of Educational Sciences, Faculty of Education and Business Studies, University of Gavle, 80176 Gavle, Sweden