This document discusses farming system research (FSR). It defines farming system as a complex matrix of interconnected agricultural components controlled by a farm household. FSR views the entire farm as a system and involves farmers in on-farm research to identify problems, design solutions, and evaluate results. The methodology of FSR includes analyzing existing systems, testing innovative farmer practices and recommended options through on-farm trials, and conducting economic analyses and follow up studies. On-farm trials are a vital part of FSR and involve diagnosis, planning, conducting experiments, assessment, and extrapolating findings. The goal of FSR is to develop viable farming system models through systems analysis approaches like flow charts.