The book provides conceptual clarity, highlights trends of change in extension work and gradual evolution of the profession. Up-to-date information have been presented lucidly on communication including both traditional folk media and new communication technologies with cases and examples. The chapters on training and transfer of technology provide tools of the trade and also discuss new concepts like Microlab, learning strategy, PRA, RRA, ITK etc. The ethics of extension and criticisms over present forms of extension have been synthesised to provide guidelines for students, researchers and practitioners.