透過結構現實主義（structural realism, SR）、新自由制度主義（neoliberalinstitutionalism, NLI ）、體系理論的建構主義（ systemicconstructivism, SC），本文逐一檢示六項研究假設，嘗試釐清與回答兩個重要的研究問題：（1）「什麼因素」影響了一個政治實體（國家或是聯盟）對另一個政治實體的行為決定？（2）權力（power）、利益（interest）、觀念（ideas）這樣的變數在涉外軍事和經貿等不同議題上扮演的重要性是否相同？結果顯示，SR 在武器禁運問題上展現較佳的解釋力，且在軍事與經貿議題之間的邏輯一致性也較高。NLI 則需要思考如何妥善處理源自國內層次的變數干擾。至於SC，則是擅長於個案（而非通案）型的事件分析，並且受到時間因素的影響。

Based on structural realism (SR), neoliberal institutionalism (NLI), andsocial constructivism with the systemic concern (SC), this essay carefullyexamines the six hypotheses respectively. By doing so, the essay clarifies andanswers two basic research questions. First, what are the factors that influencethe decision-making of states (or the group of states) to other actors?Second, whether, in the different dimensions such as military or economicissue-area, power, interest and idea as variables would exercise their influencedifferently? The conclusion is that SR enjoys a better capability to analyze theissue of why arms embargo operated by the EU, and its coherence oftheoretical logic between military and economic events is obvious solid. On theother hand, NLI inevitably encounters the problem of constrains at home bydomestic societal preference. Last, SC is good at specific case study withcomprehensive inquiry, but downplays the possibility of theoreticalgeneralization as well as suffers from the limitation of temporal effects.