在許多實際的例子上，產品或製程的品質特徵可以用一個反應變數和一個或多個解釋變數來描述，這種函數關係稱為輪廓曲線。本文主要是針對有序的類別型資料反應變數與解釋變數之間的輪廓關係來進行製程監控，而我們是用proportional odds 模式來描述這兩者之間的輪廓關係。在這個模式之下我們建構兩個管制圖來進行輪廓模型的監控，並在偵測出失控訊號之後，進行製程改變點的估計以及參數改變的診斷。最後我們舉一個例子來說明實際上如何操作使用我們所提出的管制圖。

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