S.K. MANGAL, Ph.D. Education, has been Principal, and Professor and Head of the Department of Postgraduate Studies, C.R. College of Education, Rohtak, Haryana. A distinguished teacher, researcher and administrator, who has devised several psychological tools, including Emotional Intelligence Inventory, Professor Mangal is the author of a number of useful and popular books in Education and Psychology like Advanced Educational Psychology (2nd ed.), Statistics in Psychology and Education (2nd ed.), Research Methodology in Behavioural Sciences, and Essentials of Educational Psychology—all published by PHI Learning. Also, he has published extensively in reputed journals.