Which method is commonly used alongside Six Sigma to improve quality?

The method commonly used alongside Six Sigma to improve quality is Lean methodology. Lean focuses on the elimination of waste within a process, aiming to streamline operations and enhance efficiency. When combined with Six Sigma, which emphasizes reducing process variation and improving quality through data-driven approaches, the two methodologies complement each other effectively.

By integrating Lean principles, organizations can identify areas of waste and enhance processes, while Six Sigma provides the statistical tools necessary to measure quality improvements. This combination results in a comprehensive approach to process improvement that not only targets quality but also aims for operational efficiency. The synergy between the two methodologies enables organizations to achieve higher levels of customer satisfaction and lower operational costs.

Other options like cost-benefit analysis, benchmarking, and stakeholder analysis serve important roles in decision-making and performance evaluation but are not methodologies that focus specifically on continuous improvement in the quality of processes.