To achieve their goal of defeating a materialistic world view, advocates of intelligent design take a two-pronged approach. Alongside the promotion of intelligent design, proponents also seek to "Teach the Controversy"; discredit evolution by emphasizing perceived flaws in the theory of evolution, or disagreements within the scientific community and encourage teachers and students to explore non-scientific alternatives to evolution, or to critically analyze evolution and the controversy surrounding the teaching of evolution. But the world's largest general scientific society, the American Association for the Advancement of Science, has stated that "There is no significant controversy within the scientific community about the validity of evolution." and that "Evolution is one of the most robust and widely accepted principles of modern science." The ruling in the 2005 Dover, Pennsylvania, trial, "Kitzmiller v. Dover Area School District", where the claims of intelligent design proponents were considered by a United States federal court, stated that "evolution, including common descent and natural selection, is 'overwhelmingly accepted' by the scientific community."