本研究旨在挑戰常見的內外向性單向度思維。首先，提出一個替代性假設：內外向性為雙向度之構念 ; 再者，發展出內外向性雙向度量表，並以全台北、中、南三區共1,011位大學生為施測對象。最後，透過試題分析刪減題目，並以結構方程模式（SEM）進行假設模式之驗證。 結果發現：（1）內外向性乃多向度之構念，共分為正面外向性、負面外向性、正面內向性、負面內向性四個向度。（2）「自我導向性」乃為正面內向性因素之核心構念，「活躍性」則為正面外向性因素之核心構念，有別於傳統認為「社交性」為外向性因素之核心構念。此外，本量表乃具可接受之信效度，唯效標關連效度尚待進一步驗證。 / The purpose of the study was contesting the prevailing view of the one-dimensional construct of Introversion-Extraversion ( I-E ). The researcher first proposed an alternative hypothesis that I-E is a bi-dimensional construct and developed a new type of I-E inventory treating I-E as independent dimensions. The inventory was administered to 1,011 college students form Taiwan’s 3 geographical regions and then refined by item analysis. Finally, the data was analyzed through Structural Equation Modeling (SEM) to verify the hypothetic model. The major findings are: (1) I-E is a Multi-dimensional construct including Positive Extraversion (PE), Negative Extraversion (NE), Positive Introversion (PI), and Negative Introversion (NI) as four facets. (2) The core construct of PI is “Self-orientation” and that of PE is “Activeness” which is in contrast to the conventional view of “Sociability” as the core construct of extraversion. Besides, the Multi-dimensional Inventory of Introversion-Extraversion has acceptable reliability and validity; however, the criterion-related validity remains to be verified.