Abstract: Different solutions exist in the market for B2B application frameworks, including Microsoft, Biztalk(tm) and Sun(tm) Open Net Environment (Sun ONE)1. These supply a set of standard technologies and protocols for B2B application integration. However, all of these solutions require manual coding to integrate the different layers of B2B applications. Given the multi-tier nature of B2B applications, where each tier has to be developed separately, it becomes a very complex task to develop these applications without an integrated visual and code generator environment to customize the generation process for a given B2B architecture. GAIL (the Gen-it Abstract Integration Layer) provides B2B application framework vendors a customized model-driven architecture(tm) approach for deploying B2B applications. Indeed, GAIL (1) plugs into most of the leading UML modeling tools and (2) provides a parameterized architecture(tm) blueprint to generate most of the code needed in deploying B2B applications. The benefits of integrating GAIL with B2B application solutions are: time-to-market solution delivery, customization and integration performed visually and generated systematically, enforced corporate standards in each project, drastic reduction of ongoing maintenance, and explicit knowledge management.