  Although philosophers have always been interested in social conventions, Hume’s Treatise of Human Nature offered the first systematic analysis of what they are. The topic then lay dormant until Lewis revived it in Convention, providing an analysis heavily influenced by Hume’s but far more detailed and rigorous. Lewis’s analysis continues to shape the contemporary discussion. In this section, we briefly discuss Hume and then discuss Lewis in detail. Henceforth, “convention” means “social convention.”