Book excerpt: Agricultural mechanization is a sine qua non to remove drudgery, improve working comfort, enhance timeliness, reduce losses and increase production and productivity. Accordingly, use of better power viz., tractors and different types of agricultural machines in Indian agriculture has risen sharply on Indian farms to boost food and fibre production. But to safe guard the user's interest, to ensure better quality and reliability of machines and for sustained growth of farm machinery industry, there is a need for sound scientific testing and evaluation of farm machines by using instrumentation and accepted methodology. Thus, testing and evaluation holds the proper key to standardization and quality control of agricultural machinery for better acceptability and sustained farm production. To satisfy the genuine need of different sectors, this book has been prepared. It is expected to serve as a textbook for the students of Agricultural Engineering degree and postgraduate degree programme. It may also serve the needs of professional engineers, scientists, testing institutions and research organizations dealing with testing and evaluation of agricultural machinery. This book will also cater to the needs of tractor and agricultural implement manufacturing industries, consultants, agricultural universities/colleges as a valuable reference for quailty imporvement and standardization. It is hoped this book will be a valuable reference for all students and professionals.