Goffman explains that the front stage involves a differentiation between "setting" and "personal front", two concepts that are necessary for the actor to have a successful performance. Setting is the scene that must be present in order for the actor to perform; if it is gone, the actor cannot perform. Personal front consists of items or equipment needed in order to perform. These items are usually identifiable by the audience as a constant representation of the performance and actor. The personal front is divided into two different aspects: