One piece of criticism constantly aimed at SaaS is that it’s not as “customizable” as on-premise software. Before examining this claim, we need first to define “customization” from the perspective of licensed software to provide the proper context. Traditionally, “customization” meant a change to the application source code or the creation of a module for a specific client, often with the result that the vendor ended up maintaining a branch of source code to support each client. With custom modules, the vendor would maintain only the modules’ source code but had to ensure that subsequent releases of the core product