A series of engineering tests on the Orbital Workshop was authorized following completion of the Skylab 4 mission provided that only tests which would result in significant engineering knowledge would be performed.

A series of engineering tests on the Orbital Workshop was authorized following completion of the Skylab 4 mission provided that only tests which would result in significant engineering knowledge would be performed; no compromise would be made to the desired end of mission configuration by conducting the test (10 January 1974 entry); the vehicle would be left in the final configuration no later than 15 February 1974; and only a minimum of overtime and shift operation would be expended to obtain the data.