手法を比較

	統計的プロセス管理	プロセス能力解析 (Cp, Cpk)
分野	実験計画法	統計学
系統	Process / pipeline	Process / pipeline
提唱年	1924–1931	1986
提唱者	Walter A. Shewhart	Victor Kane
種類	Process monitoring and quality control method	Quantitative process evaluation index
原典	Shewhart, W. A. (1931). Economic Control of Quality of Manufactured Product. Van Nostrand. ISBN: 978-0873890762	Kane, V. E. (1986). Process capability indices. Journal of Quality Technology, 18(1), 41–52.
別名	SPC, statistical quality control, process control charting, Shewhart control	Process Capability Indices, Capability Study, Süreç Yeterlilik Analizi, Process Performance Analysis
関連	6	2
概要	Statistical Process Control (SPC) is a data-driven quality method that uses statistical techniques — primarily control charts — to monitor a manufacturing or service process over time. By distinguishing natural process variation (common cause) from unusual, actionable variation (special cause), SPC enables practitioners to maintain processes in a stable, predictable state and to detect problems early, before defective output reaches customers.	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.