How can we improve our students comprehension of basic principle? How can students show they "comprehend" a principle, generalization or theory? Bloom talks about three ways: 1) Translation: restate the principles, generalization or theory in their own words, b) Interpretation: involve the student's recognition that the communication is describing the operation of a principle, c) Extrapolation: making of predictions based on understanding of the trends, tendencies or conditions described in the communication. This article describes the teaching strategies to promote these levels of understanding, along with ways to assess their understanding.