 In particular, researchers studied the applied moments of inertia arising in the manual assembly of a large space structure.EASE was a project of NASA's Marshall Space Flight Center and the Space Systems Laboratory at the Massachusetts Institute of Technology (later at the University of Maryland), while ACCESS was developed by NASA's Langley Research Center.Astronauts Jerry L. Ross and Sherwood C. Spring repeatedly assembled a tetrahedral truss (EASE) and a triangular column truss (ACCESS) during two extra-vehicular activities (EVAs).