1. A computer program product, tangibly embodied in an information carrier, the computer program product being operable to cause data processing apparatus to perform operations comprising: establishing a model, the model implementing application logic of an application; establishing at least one view for presenting the model; establishing at least one controller for manipulating the model; and establishing at least one storage area, the storage area relating to the controller and storing an instance of a first data structure, the instance of the first data structure comprising application data having been stored in the storage area by an access method, the first data structure having been declared prior to execution of the application.