เปรียบเทียบวิธี

	การวิเคราะห์ความสามารถของกระบวนการ (Cp, Cpk)	แผนภูมิควบคุม Shewhart สำหรับตัวแปร (X-bar / R)
สาขาวิชา	สถิติศาสตร์	สถิติศาสตร์
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1986	1931
ผู้ริเริ่ม	Victor Kane	Walter A. Shewhart
ประเภท	Quantitative process evaluation index	Statistical process control chart for variables
แหล่งต้นตำรับ	Kane, V. E. (1986). Process capability indices. Journal of Quality Technology, 18(1), 41–52.	Shewhart, W. A. (1931). Economic Control of Quality of Manufactured Product. D. Van Nostrand Company. ISBN: 978-0-87389-076-2
ชื่อเรียกอื่น	Process Capability Indices, Capability Study, Süreç Yeterlilik Analizi, Process Performance Analysis	X-bar and R chart, Shewhart chart, variables control chart, process control chart
ที่เกี่ยวข้อง	2	4
สรุป	Process Capability Analysis quantifies how well a manufacturing or business process produces output within specified tolerance limits. Introduced formally by Victor Kane in 1986, it summarises process spread and centering into dimensionless indices — most notably Cp and Cpk — allowing engineers and quality managers to judge whether a stable process is inherently capable of meeting customer or design specifications consistently.	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.