In general, this study study teacher competency development which is the main problem in efforts to improve the quality of vocational high school education. This study aims to analyze the role of need for achievement and knowledge sharing in the influence of professional commitment to competency development. The population of this study were productive teachers of State Vocational High Schools in South Tangerang City, with a total sample of 141 productive teachers. Methods of data analysis using the Structural Equation ModelPartial Least Square (SEM-PLS). The results of the study found that professional commitment had no effect on competency development. Commitment to the profession has a positive and significant effect on the need for achievement. Need for achievement has a positive and significant effect on competency development. The need for achievement is able to fully mediate the influence of professional commitment to competency development. Knowledge sharing has a positive and significant effect on competency development. Knowledge sharing has a positive and significant effect on competency development. Sharing of knowledge is able to fully mediate the influence of professional commitment to competency development.

Keywords : Professional Commitment, Competency Development, Need for Achievement, Knowledge Sharing