Producer graph oriented programming framework with scenario support

Embodiments of a producer graph oriented programming framework with scenario support have been presented. In one embodiment, a request to evaluate potential impacts by a change on an application program is received. The application program includes a set of producers, each having at least an instance and a method associated with the instance. Responsive to the request, theapplication program may be simulated with the change while the existing states and existing outputs of the producers are preserved.