BSP is the underlying framework for any Web development on top of the SAP ABAP engine, including Web Dynpro/ABAP, which is a metalayer on top of BSP. The SAP CAF is simply a harmonization of the xAPP development activities into a single composite framework. But CAF is for xAPP development, not for Web front-end design, so it tackles a completely different target; Web Dynpro/Java will remain an essential component or the Component Architecture Framework. Regarding the statement: "I've gotten to know that Web Dynpro will be gone in the next three years": Complete nonsense. Web Dynpro for ABAP certainly has a future, but there is no either/or between BSP and Web Dynpro. You have to know both perfectly to be a star in this area.