Modular programming is one way of managing the complexity. Modular programming groups related sets of functions together into a module. The module is divided into an interface and an implementation.

If the overall trend on the web has been toward interchangeable blocks of code, and even whole services, like If This Then That, which can be connected together like Lego blocks in order to ...

Waltl, Josef, Joachim Henkel, and Carliss Y. Baldwin. "IP Modularity in Software Ecosystems: How SugarCRM's IP and Business Model Shape Its Product Architecture." In Software Business: Proceedings of ...