something which a person makes up himself. A mock-up is more than a mental picture; it is a self-created image a person can see and exists as itself, or symbolizes some object in the physical universe. The term was derived from the Wor_ld War II phrase for miniature models that were constructed to symbolize weapons (airplanes, ships, artillery, etc.) or areas of attack (hills, rivers, buildings, etc.) for use in planning a battle. Mock up is also used to simply mean "create." —PDC Volume 4 Approved Glossar