Abstract: A user interface tool can use a repository of user interface elements to create a user interface. One or more of the elements in the repository can be reused within the interface or among multiple interfaces. At least some of the elements have associated behavioral information. The behavioral information can indicate how an element is to function or appear based on, for example, the device or business channel in which the user interface is used. The tool can employ a multi-layer architecture. At least some behaviors of the tool (e.g., which elements from the repository are presented to the user, which actions the user can perform on a user interface) can be dependant on one or more roles of the user.