Dr. U.G. Chitriv, M.Sc. (Mathematics), Ph.D. (Education)courses at the Post-Graduate Department of Education, Nagpur University, Nagpur. He has a unique distinction of having taught at all levels from primary to Post-Graduate which has given him rich experience of and deep insight into educational problems. His basic discipline being mathematics, he devoted himself to the cause of improving mathematical instruction and in the process got involved in the study of ‘models of teaching’. The present book is the result of his pains-taking work at the Centre of Advanced Study in Education, M.S. University Baroda where he was a teacher fellow.Dr. Chitriv has been a meritorious student, a distinguished teacher and an astute researcher throughout his career. He has presented papers on a wide variety of subjects such has ‘Analysis of Thinking’, ‘Cognitive learning Processes’,’ Mathematical Creativity’ and ‘Models of teaching’ organized by the NCERT throughout the country and National Seminar on Methodology of Educational Research held at the CASE Baroda. He participated in many national projects including those on ‘development of Training Strategy’, production of instructional Material for Distance Education’ and ‘Developing Question Bank on Teaching of Mathematics’.A few ambitious research scholars are working for their Ph.D. under his guidance.