مقایسهٔ روش‌ها

	کنترل فرآیند آماری	استقرار وظیفه کیفی
حوزه	طراحی آزمایش	طراحی آزمایش
خانواده	Process / pipeline	Process / pipeline
سال پیدایش	1924–1931	1966 (Japan); popularised in the West ~1988
پدیدآور	Walter A. Shewhart	Yoji Akao
نوع	Process monitoring and quality control method	Structured quality planning and product design method
منبع بنیادین	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
نام‌های دیگر	SPC, statistical quality control, process control charting, Shewhart control	QFD, House of Quality, customer-driven engineering, voice of the customer matrix
مرتبط	6	4
خلاصه	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.