As mentioned when discussing authority of a document, accuracy of information cannot be assumed. Knowing the credentials of the author, or knowing the document comes from a trusted source improves the odds that the information included will be accurate.
Authors can be expected to follow certain practices that assure readers about the accuracy of their content. One method is by including a bibliography and footnotes that document sources they used for facts, data, and ideas. Another means of demonstrating accuracy is to present the various sides of an argument, avoiding the bias their own opinions alone might create. An author's ability to support arguments with hard facts and sources is a demonstration of professionalism and scholarly intent.