Commercial high schools usually offer computer-related ICT classes as a part of extracurricular programs. These programs may reduce the problem of information literacy and improve the competitiveness of students through acquiring the ICT-related licenses. On the other hand, teachers responsible for the program suffer, due to the extra time and efforts required to operate these programs. The purpose of this study is to identify the determinants of attitude and planned behavior toward these extracurricular programs. This study developed a research model to analyze the factors influencing the satisfaction level and intention to participate, employing attitude toward the program, perceived usefulness, contribution to the personal growth, ease of preparation, support and incentive as major research variables. 194 survey responses from commercial high school teachers were collected for analysis. Statistical results based upon the regression analysis, as well as some useful guidelines for promoting the programs, were provided.