Purpose: The purpose of this study was to conduct the comparisons in cognitive level of basic job skills of graduates of specialized high schools, teachers of specialized high schools, and mainstream company workers. An optimal educational curriculum through the allocation of specialized, basic job skills was also suggested. Method: We analyzed the previous research on the basic ability of the profession through the theoretical review. In addition, the present status of NCS-based curriculum of G technical high school was described. The survey was conducted on teachers in G technical high school, alumni (new employees), large or medium-sized enterprises (more than 300 full-time employees), and Employees in SMEs. The questionnaire items consisted of 10 areas of occupational basic ability of National Competence Standard in which 34 items were developed. Results: Upon examining statistics that analyze the current levels of basic job skills. The results showed that the level of Basic Job Skills recognized by large and medium-sized enterprise workers was significantly higher than those of high school graduates. However, small businesses demonstrated that specialized high school graduates surpassed the others in only 5 different categories. Second, an analysis of the differences in importance of basic job skills was also conducted. Third, to develop curriculum for basic skills of specialization high school mechanical department to organize and operate NCS-based curriculum, in this study, the importance of job basic ability of graduates, teachers, and corporate workers is analyzed and suggested implications for actual education. Conclusion: This research was undertaken with the use of statistic skills. The following researches are expected to be investigated in a deep and elaborate level, and to be connected to the researches in curriculum development and effect.