เปรียบเทียบวิธี

	Six Sigma DMAIC	แผนภูมิควบคุม Shewhart สำหรับตัวแปร (X-bar / R)
สาขาวิชา	การจัดการคุณภาพ	สถิติศาสตร์
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	2014	1931
ผู้ริเริ่ม	Motorola; Pyzdek & Keller	Walter A. Shewhart
ประเภท	Structured process improvement methodology	Statistical process control chart for variables
แหล่งต้นตำรับ	Pyzdek, T., & Keller, P. (2014). The Six Sigma Handbook (4th ed.). McGraw-Hill. ISBN: 978-0-07-184053-9	Shewhart, W. A. (1931). Economic Control of Quality of Manufactured Product. D. Van Nostrand Company. ISBN: 978-0-87389-076-2
ชื่อเรียกอื่น	DMAIC Framework, Six Sigma Process Improvement Cycle, Define-Measure-Analyze-Improve-Control, Altı Sigma DMAIC	X-bar and R chart, Shewhart chart, variables control chart, process control chart
ที่เกี่ยวข้อง	3	4
สรุป	Six Sigma DMAIC is a data-driven, five-phase process improvement methodology — Define, Measure, Analyze, Improve, and Control — used to reduce defects and process variation to fewer than 3.4 defects per million opportunities. Originating at Motorola in the 1980s and systematized by practitioners including Pyzdek and Keller, it is widely adopted in manufacturing, healthcare, finance, and service industries seeking sustained quality gains.	The Shewhart control chart, invented by Walter Shewhart at Bell Labs in the 1920s and set out in his 1931 book, is the foundational tool of statistical process control. It plots a process statistic — typically the subgroup mean (X-bar) and range (R) — over time against a center line and three-sigma control limits, distinguishing the natural common-cause variation inherent in a stable process from special-cause variation that signals something has changed and warrants investigation.