Six Sigma: Process Improvement & Analysis
A collection of concepts and methods for process improvement.
- What is Six Sigma?
- DMAIC Overview
- Basic Terms
What is Six Sigma?
Six Sigma is a structured, data‑driven approach for improving processes by reducing variation and eliminating defects.
It focuses on understanding how a process behaves, identifying sources of inconsistency, and applying practical methods to make the process more predictable and reliable.
At its core, Six Sigma is about making processes work the way they’re supposed to — consistently, efficiently, and with fewer surprises.
DMAIC Overview
DMAIC is the primary improvement cycle used in Six Sigma. It provides a simple, repeatable structure for solving problems and improving processes.
Define
Identify the problem, the scope, the goals, and who the process affects.
Measure
Collect data, map the process, and establish a baseline of current performance.
Analyze
Identify root causes using data.
Improve
Develop and implement solutions to address root causes.
Control
Monitor solutions to ensure long term stability.
Basic Terms
Variation
The natural differences that occur in a process. Too much variation leads to inconsistent results.
Defect
Anything that falls outside customer expectations or process requirements.
Process Capability
A measure of how well a process meets its specifications or requirements.
Sigma Level
A numerical measure of process performance — higher sigma means fewer defects.
Root Cause
The underlying reason a problem occurs — not just the symptoms.