 The sociological concept, by contrast, must serve the needs of social theorists who seek to understand society and social behavior. It will be a technical concept that emerges from the theory or theories that best explain the phenomena the social theorist studies. Note, moreover, that a social scientist might require more than one concept of law. Hart’s descriptive sociology might be interpreted as offering a functional concept of law. Anthropologists, by contrast, often seem more interested in an  expressive concept of law. (See Pirie [2010] for a discussion that suggests an expressive account of the concept of law.) 