A white box model – also called glass box or clear box – is a system whose internal workings can be view and where all necessary information is available. Practically all systems are somewhere between a black box – where the system’s inner workings are hidden – and a white box model. The difference between a white and black box model can be seen as a difference in levels of abstraction, in that a white box model will offer all concrete detail to the components internal workings while a black box abstracts away from these details.