Generating commercial web applications from precise requirements and formal specifications

We present a new model-based approach that we are using to build commercial webbased applications. The user requirements together with a data model are formally specified in a graphical notation using the CREATIV toolset. The specification may be checked by animation before being automatically translated to Perfect notation. The Perfect Developer toolset uses automated reasoning to generate formal proofs of correctness. It then generates C++ or Java code which, in conjunction with an application framework also written in Perfect, forms the complete application including the HTML user interface. The whole process provides a rapid turnaround from new requirements to a formally-verified application.