A method and system are provided for efficient development of software application programs with user interfaces. Customarily, several specialists, including designers and developers, cooperate during the development stage of an application program. The invention teaches a strategy for making resource files external to the other compiled executable files in an application such that the information from the resource file may be obtained at runtime as needed without the need for compilation. Furthermore, the external resource file may be edited at runtime to allow designers to modify the look and feel for an application's interface without having to depend on developers to implement changes in the interface.