The 2nd Fully Revised Edition of the very well accepted book contains all the relevant, updated and revised topics including current and emerging areas pertaining to extension science which includes Concepts and Principles of Extension, Rural Sociology and Psychology, Research Methodology, Developmental Schemes in India, Management, Programme Planning and Evaluation, Process of Communication, Information and Communication Technology, Diffusion of Innovation, Training for Development, Farm Journalism, Women empowerment and Gender Mainstreaming. The data has been fully updated with years clearly marked against each to avoid confusion. Students who are aspiring to become experts in the field of Extension Science, this book will be quite helpful for them to prepare for all competitive exams including ARS and PG entrance examination in addition to equipping them in all the dimensions of extension education.