This paper examines the impact of Enterprise Resource Planning (ERP) systems from the perspective of IT architecture choices. The underlying IT architecture has implications for executive sponsorship, capital investment, ongoing support, user training, and process reengineering. This paper proposes a framework to guide the assessment of architecture choices, gaps, and implications in relation to an enterprise’s current IT infrastructure in three scenarios – the mainframe-centric environment, the network-centric environment, and the Internet-centric environment.