This paper describes lessons we have learned over the last ten years from our "Wrapping" approach to large-scale system development. Our research program in integration for Constructed Complex Systems has led to several results with system engineering applications: the wrapping expression notation "wrex" for communication among distributed entities, the Problem Posing Interpretation that inserts Knowledge-Based Polymorphism into any programming language, and a new systematization of design patterns. We show how we implement wrappings and describe example applications, A little bit of this theory goes a long way, since it was designed for extremely large systems, such as space systems, with their hundreds of organizations, thousands of components, and millions of lines of code.