過往的文獻對於獨立董事的制度，偏重於對獨立性的探討，本文則以具有相同產業背景資歷的獨立董事，其對企業經營的影響加以研究。實證的結果顯示出，具同產業專業背景的獨立董事與企業的營運績效(ROA)，依舊呈現了顯著的正向關係。但是，他們却不樂見企業以轉投資的方式來增加公司的價值，反而引導企業強化在技術方面的研發。;“Management right” and “ownership right” conflict in terms of surrogate costs in the modern types of companies. For the cost efficiency, “independent director” is gradually introduced into the board of directors in the contemporary corporate governance theory. Independent director, also named outside director, consists of simultaneously two characteristics, independence and professionality. To the least, independence can supervise management levels and protect the right of stock owners. Moreover, professionality may guide the company into more efficient and profitable while adding up the value of company.
Historical contributions to the system on the papers gave much weight on the independence. This paper focus on the study into the effects on the business management the independent directors with the background of same industry have. The evidence finds that the independent director with the background of same industry is significantly positive to the management of company, ROA. However, they usually guide companies to reinforce R&D instead of adding more value on companies by subsidiary investments.