The present work intends to identify, describe and understand the nature of the main relationships between information technology (IT) and power, in organizations which adopts ERP systems (Enterprise Resource Planning). To do so, it`s necessary to adopt a critic view,witch gives a new approach about these relationships. In the theoretical framework, power is analyzed under this critic perspective, not as a simple characteristic inside the organizational structure, and, doing this, technology shows up as one of its instruments inside organizations. It is identified a dual character of power, witch acts on two interdependent dimensions: the superficial dimension (decision-making, negotiating, interpersonal relationship, hierarchical structures and empowerment) and the deep dimension (influence systems, domination, constructing believes, symbols and meanings). The research illustrates these relationships, focusing the context of ERP information systems. Besides information generation to support management and decision making, IT also changes organizational structure. In ERP cases, this system implementation process is extremely complex and tends to change power structure inside organizations, so it`s possible to identify and describe a great number of relationships involving power and technology. This study wishes to contribute the administrative thinking to develop a more critical and comprehensive view about its own reality.