 Let us conclude by summarising the main reasons why decision theory, as described above, is of philosophical interest. First, normative decision theory is clearly a (minimal) theory of practical rationality. The aim is to characterise the attitudes of agents who are practically rational, and various (static and sequential) arguments are typically made to show that certain practical catastrophes befall agents who do not satisfy standard decision-theoretic constraints. Second, many of these constraints concern the agents’ beliefs. In particular, normative decision theory requires that agents’ degrees of beliefs satisfy the probability axioms and that they respond to new information by conditionalisation. Therefore, decision theory has great implications for debates in epistemology and philosophy of science; that is, for theories of epistemic rationality.