Information Technology has completely changed the model of Business & its impacts are comprehensively felt in the form Organization Structure, Operational efficiency, coordination, HRD & Organizational effectiveness. Information technology interacts with organizations and it has huge impact in the form of structure & the way of operational efficiency to cope with technological advancement. It can be used to change the structure of the organization and/or its subunits. One desirable impact of IT is when technology contributes to organizational flexibility. Older legacy systems were often performing critical tasks for the firm. These systems usually run on mainframe computers and are very large and complex. One management problem is deciding if and when to make massive investments to migrate these systems to up-to-date technology. There are a variety of organization structures; some important considerations in studying organizations are uncertainty, specialization, coordination, and interdependence.

KEYWORDS: Organizational Effectiveness, Operational Efficiency, Organizational Structure, Uncertainty, Interdependence.