Introduction. -- Intuitionism. G. E. Moore ; Prichard and Ross ; Intuitionism and considered. -- Emotivism. Some early versions ; C. L. Stevenson: beliefs, attitudes, 'emotive meaning' -- Prescriptivism. Advice versus influence ; Moral discourse as 'prescriptive' ; Two versions of 'prescriptivism' ; Moral discourse and conduct ; Argument in morals. -- The content of morals. Practice and principles ; What does 'moral' mean? ; Has morality a 'content'? -- Naturalism. The anti-naturalist thesis ; What the thesis does and does not imply ; A final note about moral arguments. -- Prospect.