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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.