Synopsis The book consists of 12 chapters. The chapter-I is related to terminology in experimental design while the chapter-II devoted to completely randomized block design for agricultural experiments in the field. The Chapter-III is devoted to factorial experiments in randomized block design involving two or more factors. The Chapter-IV deals with partially confounded and fully confounded factorial experiments. The Chapter-V deals with split plot design and strip plot design. The Chapter-VI deals with repetition of experiments over years with sampling in agricultural trials at cultivator’s fields, while Chapter-VII is related to sustainability of crop sequences and treatments. The Chapter-VIII deals with analysis of trials at cultivators fields while the Chapter-IX deals with sampling techniques. Chapter-X deals with Co-relation and regression studies. The Chapter-XI spells out the Agronomic considerations and synthesis of system based results. The last Chapter-XII deals with methodology and procedures for farming systems research while the schedule for data collection for farming systems characterization and evaluation is given in appendix.