A Critical to Quality Tree (CTQ Tree) is a tool that turns customer needs into specific, measurable, and actionable performance requirements.
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.
The Quincunx demonstrates that adjusting a process to “correct” it to the controls actually makes a process more out of control. I always remember it by recalling Bob Barker’s plinko board!