Abstract: The present invention provides a method, system, and computer program for providing synchronous execution between objects written in an object-oriented programming language and business logic written in a procedural programming language, while executing under control of an interactive test facility for debugging purposes. A single, logical interface is provided during debugging, while actually spanning multiple programming models based on different technologies. Using the present invention, the developer is able to debug both the object-oriented user interface part and the procedural business logic part of an application as the code executes in an integrated manner.