 In ‘Truth and Probability’ (1926a), Ramsey sets out an influential account of the nature, measurement, and norms of partial belief. The essay is a pioneering work on subjectivist interpretations of probability (also known as personalist interpretations; see the entry on  interpretations of probability). According to subjectivism, probabilities can be interpreted as numerical representations of an individual’s subjective degrees of confidence, such that two individuals could assign different probabilities to the same proposition even given the same evidence. First written in 1926 and still incomplete at the time of its publication in 1931 (a year after Ramsey’s death), ‘Truth and Probability’ was not very widely discussed until after the publication of Savage’s The Foundations of Statistics (1954), at which time subjectivism came to prominence. Many of the key ideas and arguments original to the essay have reappeared in later foundational works in the subjectivist tradition (e.g., de Finetti 1937, Savage 1954, Jeffrey 1965). This section outlines some of Ramsey’s major contributions to this tradition.