This portion of MEASUR includes tools such as the Bio-tiger wastewater model and related calculators. This tool helps users identify and evaluate the potential energy savings opportunities in the aeration stage of large-scale wastewater treatment systems. Industrial users can better understand the current oxygen requirements, supply, and aeration operating conditions of the system: the aeration tank and secondary clarifier. The tool helps understand the Monod kinetics and mass balances of the activated sludge process and test "what-if" scenarios for various opportunities to reduce energy use.