This fourth edition of Sire's work continues his investigation into, and comparison of, different world belief systems or "worldviews". The author examines and explains the basics of such "isms" as Christian theism, deism, naturalism, nihilism, existentialism, Eastern pantheistic monism, "New Age" philosophy, and postmodernism. In an increasingly pluralistic academic environment, the ability to understand and evaluate various worldviews is vitally important.