The finite nature of fossil fuel resource has made it imperative that alternative, renewable energy sources be explored. Anaerobic digestion from complex feedstock provides that necessary technology that not only supplement fossil fuel requirement but also, help sustain efficient waste management practice. For effective use of complex feedstock for biogas production kinetic models are valuable pre-requisites. "The simpler the Better" is a usual key phrase in model development. This text book provides an alternative, attractive approach to modeling biogas production from complex feedstock using very little input parameters. FEATURES OF TEXTBOOK Provides a simplified approach to characterizing complex feedstock biodegradability using simple models Shows how microbial population participating in anaerobic digestion can undergo cooperativity. Provides a simplified technique for sizing reactors used in anaerobic digestion process using biogas yield."