First, development of these documents involves performing a literature review for all evidence related to an answerable clinical question and grading it according to the AAN′s classification scheme.3 In view of the volume of literature available, a comprehensive but focused distillation of the evidence itself provides a valuable service to the practicing physician. However, unlike a traditional review article, the AAN′s use of a standardized, a priori classification system allows readers to understand the quality of evidence available for a particular clinical question.