Semantically rich domains require operative knowledge to solve complex problems in real-world settings. These domains provide an ideal environment for developing authentic constructivist e-learning environments. In this paper we present a framework and a methodology for developing authentic learning environments for such domains. The framework is based on an ecological view and characterizes dimensions of a typical constructivist environment in terms of pedagogical design, architecture, the environmental context and what is actually learned. A case-study illustrating the use of the framework to develop a just-in-time game-based learning environment is also presented. (Contains 8 figures.)