A Critical to Quality Tree (CTQ Tree) is a tool that turns customer needs into specific, measurable, and actionable performance requirements.
The Plan Do Check Act Cycle, aka A Deming wheel, Shewhart wheel or Shewhart Cycle is the foundation of continuous improvement frameworks
William Edwards Deming was an American management consultant and educator. He popularized the PDCA cycle first developed by Walter Shewhart.
A check Sheet is a data collection tool that usually identifies where and how often problems appear in a product or service.
A Pareto Diagram is a bar chart that re-orders the categories so they are rank-ordered from the largest total occurrences to the smallest.