เปรียบเทียบวิธี

	การควบคุมกระบวนการเชิงสถิติ	การขยายหน้าที่เชิงคุณภาพ
สาขาวิชา	การออกแบบการทดลอง	การออกแบบการทดลอง
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1924–1931	1966 (Japan); popularised in the West ~1988
ผู้ริเริ่ม	Walter A. Shewhart	Yoji Akao
ประเภท	Process monitoring and quality control method	Structured quality planning and product design method
แหล่งต้นตำรับ	Shewhart, W. A. (1931). Economic Control of Quality of Manufactured Product. Van Nostrand. ISBN: 978-0873890762	Akao, Y. (Ed.). (1990). Quality Function Deployment: Integrating Customer Requirements into Product Design. Productivity Press. ISBN: 978-0915299416
ชื่อเรียกอื่น	SPC, statistical quality control, process control charting, Shewhart control	QFD, House of Quality, customer-driven engineering, voice of the customer matrix
ที่เกี่ยวข้อง	6	4
สรุป	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.	Quality Function Deployment (QFD) is a structured method for translating customer needs — the voice of the customer — into specific technical requirements at every stage of product or service development. Originating in Japan in the 1960s, QFD uses a matrix-based tool called the House of Quality to make customer priorities visible, link them to engineering parameters, expose trade-offs, and maintain focus on what customers actually value throughout the design process.