For an application to be considered an modular program, it must have all of the following: Application uses encapsulation by placing each module into its own .c file which is compiled individually. The extern statement is used to share a module's variable. No other module can share a variable with the same name. A make file must be used to create the application. It cannot be created by hand from the command line. Each module share a .h file populated with the "public" elements of the module