One of the seven basic quality control tools, a control chart plots time-series data against an upper control limit (UCL) and a lower control limit (LCL) to monitor whether a process or product quality remains within acceptable bounds. Data points outside the limits are flagged as anomalies, enabling assessment of process stability. It is also applied in software testing to track defect density across modules.

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• 2021r03 #40同一難易度の複数のプログラムから成るソフトウェアのテスト工程での品質管理において，各プログラムの単位ステップ数当たりのバグ数をグラフ化し，上限・下限の限界線を超…