國際化程度（Degree of Internationalization）代表著公司將其經營活動拓展到不同國家範疇的程度。在國際企業的學術領域中，學者們長久以來都致力於研究國際化程度如何影響著公司績效（Firm Performance）。儘管如此，過去的研究卻往往有著不一致或相矛盾的發現。故本篇論文旨在提供一個新的理論架構，用以將行銷能力（Marketing Capabilities）、研發能力（R&D Capabilities）和產品多角化（Product Diversification）視為權變因素納入考量。此外，本論文亦試圖檢驗此三個因素是否會在國際化程度與公司績效間扮演著中介變數的角色。論文的實證分析則是以355間美國製造業公司為樣本，並透過迴歸模型等統計方法進行。實證結果顯示研發能力對國際化程度與公司績效的關係有著正向的干擾效果、產品多角化則有著負向的干擾效果。而行銷能力和產品多角化亦有顯著的中介變數效果。此發現對於未來學術研究和實務經營均有重要意涵。

Degree of internationalization (DOI) refers to the extent to which firms extend their operations beyond national boundaries. Researchers in international business have long been enthusiastic about how the degree of internationalization influences firm performance. Since prior studies generate inconsistent results, this thesis provides a theoretical framework which includes marketing capabilities, R&D capabilities and product diversification as the contingency factors. Additionally, it examines how these factors may mediate the DOI-performance relationship. The empirical tests are based on the pooled cross-section/time-series regression analyses of 355 U.S. manufacturing firms with a six-year time horizon. The findings show a positive moderating effect of R&D capabilities, and a negative moderating effect of product diversification, along with the mediating effects of marketing capabilities and product diversification. These findings offer valuable implications to future researchers and empirical managers.

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