本研究主要以考科單元能力（Ability）的觀點，提出應用管制圖（Control Chart）工具之品質管制特性，並且結合相關的統計方法，據以評估測驗（Test）命題之情形。本研究除了將試題品質（Test Quality）指標（Index）依照一般測驗的評鑑標準進行探討外，也將以標準差（Standard Deviation）作為管制圖的管制界限，以建立一個試題品質的評鑑標準。研究結果顯示，本文所使用的評鑑標準，不僅能更清楚地了解品質等級，並且可以更明確地指出試題的品質情形。

　　Based on the view of the unit ability, the study purposes to employ features of control chart and to integrate relevant statistical methods for assessment of the test quality in the joint examination. This article achieves the establishment of criteria for assessing test quality by exploring the index of test quality in the general test area, and using standard deviation for the control limit of control chart. The result of the research indicates that the criteria can demonstrate the levels of test quality in finer state and more accurately point out the situation of quality.