Provides a broad yet rigorous introduction to the fundamentals of decision theory (the collection of mathematical, logical, and philosophical theories of decision making by rational individuals) that pays particular attention to matters of philosophical and logical interest. Until recently, decision theory has been applied mainly to the domains of statisticians, mathematicians, economists, and management scientists. This text, which assumes no mathematics beyond high-school algebra, offers students of philosophy and social and management sciences a thorough grounding in both the philosophical and formal aspects of decision theory.