Farm level models have been widely used in agricultural economic studies. This book provides an in-depth description of different methodologies and techniques currently used in farm level modelling. Whilst chapters will give an overview of the theoretical grounding behind the models, it will take an applied stance; more specifically using cases from the application of modelling to policy reforms and the subsequent impacts on rural communities and food supply. This book also provide descriptions on using farm level models in much wider field such as aggregation and linking with sectoral models.