Event-B Modeling for Use Case Diagrams and Application in Immune System Model

UML is a general modeling language. The use case diagram in UML macroscopically describes the functions that can be realized by the system, which has been widely used in the requirement analysis phase of the system. However, UML is a semi-formal modeling language, which cannot be formally verified. Event-B is a formal modeling method based on Rodin platform. Rodin platform contains rich provers that can be formalized in the early stage of software development to improve the consistency, integrity and reliability of software design. This paper proposes a method to convert the use case diagram to Event-B based on relationship, and gives the abstract implementation steps. It was applied in the biological immune system, and the conversion process of the use case diagram of cellular immunity to Event-B was given. Finally, a simple verification is carried out with the ProB prover.