Classroom teaching has two aims: learning philosophy, that is, the great philosophers, and doing philosophy. This article provides an overview of thirty exercises that can be used for doing philosophy, grouped into three approaches. The first approach, doing philosophy as connective truth finding or communicative action, is related to such philosophers as Dewey and Arendt, and is illustrated by the Socratic method. The second, doing philosophy as test-based truth finding, is related to such philosophers as Popper, and is illustrated by (...) Community of Philosophical Inquiry. The third, doing philosophy as juridical debate, judging truth-value and making judgment, is related to such philosophers as Foucault, and is illustrated by philosophical debate. The analysis shows that although the classical methods applied by the great philosophers appear to be missing from classroom exercises, they do, in fact, remain at the heart of the matter. (shrink)