# Decision theory

**Decision theory** (or the **theory of choice** not to be confused with choice theory) is the study of an agent's choices.[1] Decision theory can be broken into two branches: normative decision theory, which analyzes the outcomes of decisions or determines the optimal decisions given constraints and assumptions, and descriptive decision theory, which analyzes *how* agents actually make the decisions they do.

Decision theory is closely related to the field of game theory[2] and is an interdisciplinary topic, studied by economists, mathematicians, data scientists, psychologists, biologists,[3] political and other social scientists, philosophers[4] and computer scientists.

Empirical applications of this theory are usually done with the help of statistical and econometric methods.