In the article Integrating CICS with the Jbi4CICS Component Amedeo Cannone and Stefano Rosini describe how to integrate a CICS system using a JBI component.
To me it shows two things.
1. How standardization (JBI) helps to create reusable components.
2. The power of the modularization with clearly defined responsibilities.
The result is that you can integrate your legacy assets with minimal effort.