The Anthropic Principle, in use by physicists, astronomers, and cosmologists, is currently under consideration by philosophers. This principle, in its various forms, appeals to man's existence as a constraint on our determination of natural laws and natural constants, as a principle of prediction, and, in its strongest form, as a principle of explanation which sanctions an argument for the universe being a product of design. What I shall endeavour to show here is how this principle, in its various forms, is (...) used in furthering our understanding of cosmology, and why this principle cannot be used as a principle of explanation. (shrink)

Barrow and Tipler’s contention that the Anthropic Principle is obviously true and removes the need for an explanation of fine-tuning fails because the Principle is trivially true, and only within the context of a World Ensemble, whose existence is not obvious, does a selection effect become significant. Their objections to divine design as an explanation of fine-tuning are seen to be misconceived.