This is a textbook, written on the basis of new syllabus recommended by 4th Dean's committee. This book is majorly for undergraduate and postgraduate students in extension education at Home Science College. It shall also serve as reference book for extension students of Agriculture, Veterinary, Forestry, Fisheries, Basic Science etc. in the Universities, College and Institutes. It shall also serve as handbook for Government Departments, Non- Government Organizations, Rural Banks and Cooperatives, Krishi Vigyan Kendras etc. and help them in extension works. This book describes various concepts...