This chapter discusses the fact-value problem in metaethics and different theories that have attempted to address it. It introduces Hume's view that one cannot derive ought from is, Moore's naturalistic fallacy that you cannot define goodness in natural terms, and Ayer's emotivism which holds that moral statements express attitudes rather than having truth values. It also covers prescriptivism proposed by Hare which sees moral judgments as having both descriptive and prescriptive elements.