This document discusses evaluating educational videogames. It presents a model for classifying the different types of learning that can occur in games, including things players must learn, can learn, and might learn collaterally. The model involves categorizing learning objectives and can help identify games' educational potential and how to support learners. The document argues this structured analysis is needed since game and instructional designers come from different perspectives; it also provides examples of how different games might fit into the learning categories.