The World Wide Web offers a great availability of heterogeneous educational resources. This suggests the idea that such materials can be reused in compose courses. In this paper we address this issue by proposing an architecture for composing teaching courses using "the best parts" of heterogeneous educational materials available on the Web. Course composition relies on a simple but effective evaluation methodology which reproduces real techniques used by teachers in composing and improving classroom courses. The final goal of this article is to help the teacher to construct his course until the obtension of a steady course. We present our initial work and discuss about future developments.