Previous studies have suggested that individuals need to invest in the accumulation of career competencies. To demonstrate how to acquire career competencies, a model consisting of the knowing why, knowing how, and knowing whom competencies was actively discussed in the previous studies. This study seeks to identify the relationships among these competencies based on three ways of knowing, and their effects on perceived work performance. Furthermore, this study tried to identify the importance of each of these competencies in predicting perceived individual performance in the business workplace environment. The findings showed that the knowing why, knowing how, and knowing whom competencies all have a statistically significant positive influence on perceived individual work performance. Also, the study results showed the relative importance of the three competencies for perceived work performance. Specifically, the study results showed that the effects of the knowing why and knowing whom competencies are greater than the effect of the knowing how competency. The theoretical and practical implications of the study results were provided, including empirical evidence of the validity of the career capital model, the appropriateness of the career competency model based on the three ways of knowing, and assignment of resources for the acquisition of career competencies.

Abstract
1. Introduction
2. Literature Review
    2.1. Career Competency
    2.2. Knowing Why and Work Performance
    2.3. Knowing How and Work Performance
    2.4. Knowing Whom and Work Performance
    2.5. Career Competency and Work Performance
3. Methods
    3.1. Participants
    3.2. Instruments
    3.3. Analysis
4. Results
5. Discussion and Conclusion
References

• Yong-Ho PARK(Department of Creative Human Resource Development, College of Social Science, Incheon National University) Corresponding Author.