The purpose of this research is to examine the effects of organizational factors on individual-level information technology assimilation process. The result of research suggests that managers should actively exercise their leaderships. and not passively rely on the organizational culture elements to induce users` participation and involvement in IS development process. Another finding is that both organizational culture and leadership can affect individuals` IS usage directly. However, organizational culture seems to have a negligible total impact on IS usage. This research also indicates that leadership can positively affect user performance through improving user involvement, user satisfaction, and IS usage. This research concludes that there is a strong indication that leadership can significantly affect individuals` information technology assimilation process.