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| 管理図× | 統計的プロセス管理× | |
|---|---|---|
| 分野 | 実験計画法 | 実験計画法 |
| 系統 | Process / pipeline | Process / pipeline |
| 提唱年≠ | 1924 (first use); 1931 (seminal book) | 1924–1931 |
| 提唱者≠ | Walter A. Shewhart (Bell Labs) | Walter A. Shewhart |
| 種類≠ | Statistical monitoring and control technique | Process monitoring and quality control method |
| 原典 | Shewhart, W. A. (1931). Economic Control of Quality of Manufactured Product. Van Nostrand. link ↗ | Shewhart, W. A. (1931). Economic Control of Quality of Manufactured Product. Van Nostrand. ISBN: 978-0873890762 |
| 別名 | Shewhart chart, process-behavior chart, SPC chart, quality control chart | SPC, statistical quality control, process control charting, Shewhart control |
| 関連 | 6 | 6 |
| 概要≠ | A control chart is a time-series graph with statistically derived upper and lower control limits that separates the natural, random variation of a process (common cause) from unusual, assignable variation (special cause). Invented by Walter Shewhart at Bell Labs in 1924, control charts remain the foundational tool of Statistical Process Control and are used across manufacturing, healthcare, software, and service industries to monitor whether a process remains stable and predictable over time. | 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. |
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