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| Tilastollinen prosessinohjaus (SPC)× | Quality Function Deployment× | |
|---|---|---|
| Tieteenala | Koesuunnittelu | Koesuunnittelu |
| Menetelmäperhe | Process / pipeline | Process / pipeline |
| Syntyvuosi≠ | 1924–1931 | 1966 (Japan); popularised in the West ~1988 |
| Kehittäjä≠ | Walter A. Shewhart | Yoji Akao |
| Tyyppi≠ | Process monitoring and quality control method | Structured quality planning and product design method |
| Alkuperäislähde≠ | 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 |
| Rinnakkaisnimet | SPC, statistical quality control, process control charting, Shewhart control | QFD, House of Quality, customer-driven engineering, voice of the customer matrix |
| Liittyvät≠ | 6 | 4 |
| Tiivistelmä≠ | 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. |
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