International Journal of Academic Information Systems Research (IJAISR)   Year: 2019 | Volume: 3 | Issue: 7 | Page No.: 1-22 Survey of Rule-Based Systems Naser Masri, Yousef Abu Sultan, Alaa N. Akkila, Abdelbaset Almasri, Adel Ahmed, Ahmed Y. Mahmoud, Ihab Zaqout, Samy S. Abu-Naser Abstract: : Rule-Based Systems (RBS) are computer programs based on technologies established by Artificial Intelligence research, which express some characteristics of human knowledge and expertise to perform tasks normally done by human experts. Thus, a Rule -based system has two distinguishing features: a Rule base and an inference engine. The first part, the Rule base, represents facts about the world. The second part, the inference engine, allows new knowledge to be inferred. Most commonly, it can take the form of IF-THEN rules coupled with forward or backward chaining approaches. The paper introduce the concept of Rule based systems, Architecture of a Rule -Based System, Tools for Building Rule -Based System, and brief introduction to the most popular Rule based systems found in the literatures.