Hippocratic treatises are early text of medicine, compiled by several scholars, collectively known as Hippocratic Corpus. For the first times in history, Hippocrates rejects the divine theory of disease and laid-down the foundation of scientific medicine. Diseases were described on natural causes. They proposed humoral theory of diseases. According to this theory, there are four humors in the body. Harmony among these humors constitutes a good health. Age, sex, season, diet and regime affect the production of humors and impart their effect on the condition of body. Various ways were adopted for categorization and classification of diseases, making medical studies easier. In these treatises, diseases were broadly categorized based on age, sex and population distribution. Nomenclature of disease was also based upon the name of diseased organ, dominating symptom, etiology and its resemblance with the thing and phenomenon in outer world. This study is focused on understanding Hippocratic classification and categorization of diseases.

Path delay fault models are introduced to diagnose failures that cause sequential circuits malfunction and violate timing specifications. For delay faults tests, a pair of test vectors is used for each path to be tested. Diagnosis of failure in asynchronous circuits is more important since the delay faults can change the function of the circuit. .However, asynchronous circuits and their faults are yet to be understood. The purpose of this study is to first identify whether the existing paths will accurately measure delays. Furthermore, a new definition for paths is introduced, which leads to a new category of path delay faults. This new category is different from previously proposed categories by suggesting simultaneous evaluation of pair vectors. Finally, the experimental results for SIS benchmark circuits are shown and the fault coverage is calculated for each circuit.