The Personality Test Expert System Based on Myers-Briggs Theory Type Indicator with the Android-based Forward Chaining Method is designed to make it easy to know one's personality type. This personality test expert system is designed using the Unified Modeling System (UML) design model. The proposed design system is described in three stages of the diagram, namely use case diagrams, activity diagrams, and sequence diagrams. Knowledge of this expert system was obtained from various sources and books related to personality types based on the Myers-Briggs Type Indicator (MBTI) theory. Knowledge base is arranged in such a way into a database with several tables, and If-Than rule so as to facilitate system performance in drawing conclusions. Conclusion in this expert system uses a forward chaining method. This expert system will display questions as symptoms that can be chosen by the user, and each choice of symptoms will bring the user to the choice of the next symptoms until the final results are obtained. In the final results the system will provide a conclusion of the user's personality type. A user who knows his personality will get information about his personality.

Keywords: Expert System, MBTI, Fordward Chaining