A desirable tuning solution should not only be effective for minimizing NO x emissions but also should offer opportunities for improved thermal performance leading to cost savings and a rapid return on investment. Guided by these objectives TVA decided to apply the ULTRAMAX Method, which utilizes a new technology, co-developed by EPRI and Ultramax Corp., called sequential process optimization. The paper describes the ULTRAMAX Method which consists of a methodology and the supporting computer software that builds on existing boiler system knowledge and guides the operator through a sequence of control parameter adjustments to achieve ever-improving levels of performance.