In recent years, there has been a significant motivation to develop software techniques for the noninvasive diagnosis of abnormal functioning of the vocal apparatus by studying the patients' voice signal. Diagnosing vocal tract pathologies is a task that demands considerable investigation due to the diversity of possible problems and the lack of standards among speech pathologists. Learn more about noninvasive pathology approaches for the prediction of healthy and affected voice signals from this Lecture Notes in the IEEE Signal Processing Magazine (January 2010).