Introduction.- Elements of Subjective Opinions.- Opinion Representations.- Decision-Making Under Vagueness and Uncertainty.- Principles of Subjective Logic.- Addition, Subtraction and Complement.- Binomial Multiplication and Division.- Multinomial Multiplication and Division.- Conditional Deduction.- Conditional Abduction.- Joint and Marginal Opinions.- Fusion of Subjective Opinions.- Unfusion and Fission of Subjective Opinions.- Computational Trust.- Trust Networks.- Bayesian Reputation Systems.- Subjective Networks.