After a critical summary and analysis of syllogistic, inductive, and modern symbolic logic, this book undertakes a study of the concepts, symbolism, and applications of what has become known as deontic logic, or the logic of obligation, particularly as it relates to moral and legal reasoning involved in the making of decisions, choices, and the performance of human actions. The meanings of the terms act and action are thoroughly discussed as are the terms omission and attempt. Both dyadic and multi-valued versions of deontic logic and the insights of Lofti Zadehs fuzzy logic are referenced throughout the book, specifically