This book describes the nature of technological changes in farming methods among different size groups of farm households. The study covers a sample of 300 farming units, spread over three districts of Andhra Pradesh. The temporal study examines the impact of HYV seeds and mechanisation on production and productivity of chosen crops among different size holdings. A study has also been made of the impact of seed fertiliser technology and mechanisation of farm labour employment among size categories. Further, a careful study has also been conducted of the changes in income generation and asset formation and changes in production relations as witnessed by changes in the land ownership structure.