1. A method for viewing mappings between objects, comprising: displaying a main view that shows one or more source objects, one or more target objects, and one or more mappings between the one or more source objects and the one or more target objects; receiving input selecting a type of view to be displayed in the main view, wherein each type of view provides a different amount of detail regarding the mappings; and in response to receiving the input, creating the selected type of view; and displaying the created view.