The new riddle of induction has become a well-known topic in contemporary philosophy - so well-known that only a philosophical hermit wouldn't recognize the word 'grue'. The best philosophy journals carry several new articles on the puzzle every year.

There are now about 20 different approaches, or types of proposed solution, to the grue problem: the entrenchment solution, the positional-qualitative solution, the simplicity solution, the natural kind solution, the coherence solution, the incoherence dissolutions, the falsificationist response, the evolutionary approach, the various Bayesian treatments, and so on. No single approach has emerged as the consensus view or even as a clear leader.

This book contains 15 essays on grue, all by writers at the summit of modern philosophy. Seven are classics and eight were written for this volume. Also included is a comprehensive annotated bibliography, describing all 316 significant works on grue from 1946 to the 1990s.