This essay explains why cost accounting, ethical accountability, and accounting principles are interrelated concepts. During the past two decades, the relationship between accounting systems and discharge of accountability has increasingly drawn the attention of researchers. However, researchers have shown a marginal interest in the inclusion and examination of the theme of cost accounting, and in particular, no interest has been oriented to explore the potential role of cost accounting in serving presentation of the trustful cost information as regards the discharge of accountability. In this essay, we will reason that the traditional discourse of cost accounting is fundamentally different from the managerial discourse of cost accounting. The traditional cost accounting is built upon the ethical, legal, professional, and principle-based discourses. By exploring the differences between the two cost accounting discourses, this essay will reduce the effect of current skeptical views with which quality of our academic education, relevance of our research, and our understanding of the potential role of cost accounting in serving the provision and presentation of trustful information have been eriously undermined.