Six Sigma Green Belt Certification Practice Exam

Which design methodology is appropriate for existing process improvement projects in Six Sigma?

1. DMADV

2. DPMO

3. DFSS

4. DMAIC

The correct answer is: DMAIC

The selection of DMAIC as the appropriate design methodology for existing process improvement projects in Six Sigma is correct because DMAIC is specifically tailored to improve and optimize existing processes. The five phases of DMAIC—Define, Measure, Analyze, Improve, and Control—guide practitioners through a structured approach to identify inefficiencies, analyze root causes, implement solutions, and establish controls to sustain improvements. This methodology is focused on making incremental improvements to existing processes and is widely adopted in various industries for enhancing performance. In contrast, the other methodologies mentioned are more suited for different contexts. DMADV, which stands for Define, Measure, Analyze, Design, and Verify, is primarily used for creating new processes or products rather than improving existing ones. DPMO (Defects Per Million Opportunities) is a metric used to measure process performance and does not constitute a design methodology itself. DFSS (Design for Six Sigma) focuses on designing new products or processes that meet customer requirements from the outset, making it less applicable to projects aimed at improving existing processes.