承諾續擴乃指決策者在面對負面結果時，反而增加投入資源的承諾與冒著產生更多損失的風險(Staw, 1976)。本研究以大學會計系及非會計系的學生為研究對象，透過受試者間之實驗設計進行研究，探討管理會計知識、決策風險與計劃完成度三變項對承諾續擴行為之影響，以增加對影響承諾續擴因素的瞭解，進而達到降低決策偏誤、提升決策品質之目的。
　　研究結果顯示，三個自變數中，僅計劃完成度有顯著的影響，且計劃完成度愈高，續擴傾向亦愈高。然而，若考慮投資損益金額，計劃完成度的影響減弱了，由此可知，承諾續擴會受計劃完成度以及投資損益金額影響。

Escalation of commitment refers to the phenomenon whereby, in the face of negative consequences, decision-makers increase resource commitment and risk further losses (Staw, 1976). The subjects are the college students of accounting department and non- accounting department. The experimental groups followed a 2 levels of managerial accounting knowledge (sunk cost knowledge vs. no sunk cost knowledge) × 3 levels of percentage of project completion (10% vs. 50% vs. 90%) × 2 levels of decision risk (high vs. low) between-subjects design. This thesis examines the effect of managerial accounting knowledge, decision risk and percentage of project completion on escalation of commitment, which enhances the understanding of resources allocation behaviors. Furthermore, it could help decision makers not only to reduce bias but also to reach higher quality in decision making.
The results showed that among the three variables, only percentage of project completion has significant effects on escalation of commitment. Besides, the higher the percentage of project completion, the higher degree of the escalation of commitment is. However, when taking the amount of investment profits or losses into considerations, the effect of percentage of project completion on escalation of commitment decreases. Therefore, percentage of project completion and the amount of investment profits or losses have significant effects on escalation of commitment.

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
一、緒論 1
1.1 研究背景與動機 1
1.2 研究目的 4
1.3 研究架構 5
二、文獻探討與研究假說 6
2.1 承諾續擴 6
2.1.1 沉沒成本效果 7
2.1.2 影響承諾續擴行為的因素 9
2.2 決策風險與承諾續擴 12
2.3 計劃完成度與承諾續擴 12
2.4 決策風險、計劃完成度與承諾續擴 13
2.5 特定工作攸關知識與決策 14
2.6 研究假說 15
三、實驗一 18
3.1 研究方法 18
3.1.1 實驗工作 18
3.1.2 實驗問卷 18
3.1.3 受試者 22
3.1.4 實驗程序 22
3.1.5 實驗變數 24
3.2 研究結果 26
3.2.1 初步分析與操弄檢核之分析 26
3.2.2 決策風險對承諾上升之影響－假說H1檢定 31
3.2.3 計劃完成度與決策風險對承諾上升之綜合影響－假說H2檢定 32
3.2.4 沈沒成本知識、決策風險與計劃完成度對決策之綜合影響－假說H3檢定 33
3.2.5 本章小結 35
四、實驗二 37
4.1 研究方法 37
4.1.1 實驗工作 37
4.1.2 實驗問卷 38
4.1.3 受試者 41
4.1.4 實驗程序 41
4.1.5 實驗變數 42
4.2 研究結果 43
4.2.1 初步分析與操弄檢核之分析 43
4.2.2 決策風險對承諾上升之影響－假說H1檢定 48
4.2.3 計劃完成度與決策風險對承諾上升之綜合影響－假說H2檢定 50
4.2.4 沈沒成本知識、決策風險與計劃完成度對決策之綜合影響－假說H3檢定 50
4.2.5 本章小結 53
五、結論與建議 54
5.1 研究結論 54
5.2 研究貢獻 55
5.3 研究限制 56
5.4 研究建議 56
參考文獻 58
附錄一 實驗一問卷 62
附錄二 實驗二問卷 65

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