A presentation of current work that systematically explores and articulates the nature, origin and development of reasoning, this volume's primary aim is to describe and examine contemporary theory and research findings on the topic of deductive reasoning. Many contributors believe concepts such as "structure," "competence," and "mental logic" are necessary features for a complete understanding of reasoning. As the book emanates from a Jean Piaget Symposium, his theory of intellectual development as the standard contemporary treatment of deductive reasoning is used as the context in which the contributors elaborate on their own perceptions.

Introduces readers to the history of necessity and possibility, two modal concepts which play a key role in philosophy.

This is a reissue of a book which is an exploration and defence of the notion of modality 'de re', the idea that objects have both essential and accidental properties. It is one of the first full-length studies of the modalities to emerge from the debate to which Saul Kripke, David Lewis, Ruth Marcus and others have contributed. The argument is developed by means of the notion of possible worlds, and ranges over key problems including the nature of essence, trans-world identity, negative existential propositions, and the existence of unactual objects in other possible worlds. In the final chapters Professor Plantinga applies his logical theories to the clarification of two problems in the philosophy of religion - the Problem of Evil and the Ontological Argument.

Originally published in 1993, this monograph addresses a central problem in Piaget’s work, which is the temporal construction of necessary knowledge. The main argument is that both normative and empirical issues are relevant to a minimally adequate account of the development of modal understanding. This central argument embodies three main claims. One claim is philosophical. Although the concepts of knowledge and necessity are problematic, there is sufficient agreement about their core elements due to the fundamental difference between truth-value and modality. Any account of human rationality has to respect this distinction. The second claim is that this normative distinction is not always respected in psychological research on the origins of knowledge where emphasis is placed on the procedures and methods used to gain good empirical evidence. An account of the initial acquisition of knowledge is not thereby an account of its legitimation in the human mind. The third claim relates to epistemology. Intellectual development is a process in which available knowledge is used in the construction of better knowledge. The monograph identifies features of a modal model of intellectual construction, whereby some form of necessary knowledge is always used. Intellectual development occurs as the reduction of modal errors through the differentiation and coordination of available forms of modal understanding. Piaget’s work continues to provide distinctive and intelligible answers to a substantive and outstanding problem.

The Cambridge Companion to Piaget provides a comprehensive introduction to different aspects of Jean Piaget's work.

Reasoning about knowledge—particularly the knowledge of agents who reason about the world and each other's knowledge—was once the exclusive province of philosophers and puzzle solvers. More recently, this type of reasoning has been shown to play a key role in a surprising number of contexts, from understanding conversations to the analysis of distributed computer algorithms. Reasoning About Knowledge is the first book to provide a general discussion of approaches to reasoning about knowledge and its applications to distributed systems, artificial intelligence, and game theory. It brings eight years of work by the authors into a cohesive framework for understanding and analyzing reasoning about knowledge that is intuitive, mathematically well founded, useful in practice, and widely applicable. The book is almost completely self-contained and should be accessible to readers in a variety of disciplines, including computer science, artificial intelligence, linguistics, philosophy, cognitive science, and game theory. Each chapter includes exercises and bibliographic notes.

This volume, which includes some previously published work and the most recent writings of the late Martin Braine and his colleagues, will be of interest to cognitive scientists, philosophers of mind and logicians, developmentalists, and psycholinguists.