Jewell (Virginia Commonwealth University) explains research methods to physical therapists who choose to apply research study evidence to actual patients in the clinical setting. The graduate textbook describes different approaches to research design, different types of variables, factors that threaten a study's validity, the evaluation of research results, systematic reviews of individual studies, and the use of physiologic studies to answer clinical questions. Annotation ©2008 Book News, Inc., Portland, OR (booknews.com)