DMAIC (Six Sigma Problem Solving)

When to use

Use DMAIC when:

• A problem has recurred multiple times despite previous corrective actions
• The process needs measurable, data-driven capability improvement (Cpk improvement target)
• The root cause is unknown and requires statistical analysis to identify
• A customer requires a Six Sigma approach or asks for a DMAIC report
• The improvement opportunity involves eliminating chronic waste (rework, scrap, test failures)

Use 8D instead when: The problem is a single customer complaint, an escape to the field, or requires immediate containment. 8D is reactive and fast. DMAIC is proactive and thorough — it takes weeks to months.

Use PDCA instead when: The improvement is incremental and the root cause is already known or assumed.

Prerequisites