This paper presents a framework for the integration of web-based educational systems. It is part of a research project, MEDEA1 , whose final goal is to develop a general framework to build open Intelligent Tutoring Systems (ITS). We understand “open system” as a set of autonomous educational modules which communicate between themselves, following high-level preestablished protocols. Each module can be an intelligent component with its own instruction strategies, or other components like support tools, web pages, etc. In the second case, the adaptive capabilities are left to the ITS instructor core. The architecture opens up the possibility to include new web-based components.