A system controls operation of a business system having a processor, memory, and a hard drive. The system comprises a specification language file stored on a hard drive, the file containing specification language statements defining a state machine implementation of a business system, a parser for extracting specification language statements from the specification language file and interpreting the extracted specification language statements, a business logic application program comprised of business logic modules, the business logic modules including executable compiled program statements, and the parser calls at least one of the business logic modules to process a message extracted by the parser from the specification language file.