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Software testing consists of reviewing software to determine whether it is functioning as expected or not. There are many testing techniques available. A tester should be able to choose the appropriate technique for each case at hand. Sometimes, testers find it difficult to test software, especially dynamic ones that describe the flow of an organization's business processes. This study focuses on testing the process flow in an information system and applying state transition diagram to test the transition between states. This research aims to determine how to properly test the business process flow of an information system using the state transition diagram and ensure the suitability of the business process flow. This stage of research begins with creating a state transition diagram based on the business process flow. Following the creation of the state transition diagram, the system will be tested. The final stage is to make changes based on the test results. The study concludes that the system, which was initially unable to handle business processes properly, has now succeeded in running precisely by the existing business processes. Tests and improvements have resulted in a system that is correct in terms of business process flow. Since state transition diagrams have proved successful in testing information systems, new guidelines for testing the transitions between states have been developed. [ABSTRACT FROM AUTHOR]