Singleton to sandwich chunking into buslets for better system development

With the rising cost of developing increasingly complex software intensive systems, improved strategies to join together legacy systems are desirable. Connecting black boxes not easily customized by the integrator requires architectural innovation and new integration practices. Middleware software solutions turn disparate hardware systems into system of systems service oriented architecture but there still needs to be a common underlying service with a consistent data structure to the overall system. This paper proposes an innovative approach to transposing software subsystems into the dominant flow down system engineering process used in many large programs today, specifically; large legacy bound architectures The paper suggest this can be accomplished by creating a hybrid architecture pattern from two established software patterns, singleton and sandwich, which would allow users to phase in service availability long before dominant system engineering processes are completed.