International Journal of Academic Engineering Research (IJAER)   Year: 2021 | Volume: 5 | Issue: 6 | Page No.: 7-12 Knowledge Based System for Diagnosing Throat Problem CLIPS and Delphi languages Mohammed A. Alkahlout, Azmi H. Alsaqqa, Tanseem N. Abu-Jamie, Samy S. Abu-Naser Abstract: Background: Throat problems are common, include a variety of abnormal or unusual sensations or problems of the throat and have. You've probably had a sore throat. The cause is usually a viral infection, but other causes include allergies, infection with strep bacteria or the leaking of stomach acids back up into the esophagus, called GERD. Other problems that affect the throat include Tonsillitis, Cancer, Croup, - inflammation, Laryngitis Objectives: The main goal of this expert system is to get the appropriate diagnosis of disease and the correct treatment by presenting suggestions on Throat disease to the user by asking about symptoms. Methods: CLIPS and Delphi languages were used as the main tools for designing our Knowledge based system.