Bruno de Finetti (1906–1985) is the founder of the subjective interpretation of probability, together with the British philosopher Frank Plumpton Ramsey. His related notion of “exchangeability” revolutionized the statistical methodology. This book (based on a course held in 1979) explains in a language accessible also to non-mathematicians the fundamental tenets and implications of subjectivism, according to which the probability of any well specified fact F refers to the degree of belief actually held by someone, on the ground of her whole knowledge, on the truth of the assertion that F obtains.
A very nice introduction to the subjectivist view of the bayesian school of statistics. It is really nothing more than probability theory with a flavor of good old british empiricism. The lectures are mostly in dialogue form, they are interesting, engaging and may be useful for anyone interested in philosophy, statistics, artificial intelligence, logic, etc. De Finetti was one of the greatest minds of the XXth century.