The first half of the course consisted in a "tour through the landscape of metaethics." I used the following flowchart as our "roadmap" through that landscape, which - in tandem with our discussions, of course - I felt helped the students to understand how the various views hang together, which, in turn, helped them to understand the various views themselves.

(I realize this flowchart is in certain respects oversimplified. Fans of Sturgeon-style non-reductionist naturalism may complain their view is not represented, as may quasi-realists. [That said, I would resist the claim that Sturgeon-style naturalism is not represented here.] A more serious flaw is that the flowchart does not comfortably make space for reductions of moral normative phenomena to non-moral normative phenomena taken as irreducibly normative. Regardless, I made a point to be clear with the students that this framing was in certain respects an oversimplification, and that the harm of oversimplification struck me as outweighed by the helpfulness of the simplicity. Were I to teach the course for majors, I would at least revise the flowchart to accommodate reductions of moral normative phenomena to non-moral normative phenomena taken as irreducibly normative.)