A role-playing game set in the Terran Trade Authority (TTA) universe created by Stewart Cowley in 1978, with the book Spacecraft 2000-2100 A.D.: Terran Trade Authority Handbook. The TTA series included other TTA books (Spacewreck, Starliners, Great Space Battles, Starbase 2000) and 6 unofficial TTA books Cowley published under the pseudonym Steven Caldwell. The books and setting were widely known for the great art which Cowley bundled together under the TTA brand from various pulp scifi magazine and book covers. The RPG builds on and expands on the universe Cowley created.
The TTA RPG uses the OMNI system mechanic, but is self contained and requires no other books to play.