Abstract: A method and apparatus for developing an application for utilization on a selected end user computing device may comprise modeling a screen display specific to the selected end user computing device, utilizing a development user computing device, by selecting an object for a user interface display or a control of a functionality of the application running on the selected user computing device, at run time, utilizing a prototyping display screen modeler during design time, which may be operating on the development user computing device or being accessed over a network by the development user computing device and constructing the model screen display specific to the selected end user computing device during design time, utilizing a user interface display on the development user device of a selection of controls or a selection of data sources displayed on the user interface display of the development user device.