Key Six Sigma Concepts

At its core, Six Sigma revolves around the following key concepts:

1. Critical to quality (CTQ): Attributes most crucial for the customer
2. Defect: Failing to deliver what the customer wants
3. Process capability: What one’s process can deliver
4. Variation: What the customer sees and feels
5. Stable operations: Ensuring consistent, predictable processes to improve what the cus­tomer sees and feels
6. Designfor Six Sigma: Designing to meet customer needs and process capability

Source: Poornima M. Charantimath (2017), Total Quality Management, Pearson; 3rd edition.