The Computational Structural Mechanics (CSM) activity is developing advanced structural analysis and computational methods that exploit high-performance computers. Methods are developed in the framework of the CSM testbed software system and applied to representative complex structural analysis problems from the aerospace industry. An overview of the CSM testbed methods development environment is presented and some numerical methods developed on a CRAY-2 are described. Selected application studies performed on the NAS CRAY-2 are also summarized. Knight, Norman F., Jr. and Mccleary, Susan L. and Macy, Steven C. and Aminpour, Mohammad A. Langley Research Center ARCHITECTURE (COMPUTERS); COMPUTER AIDED DESIGN; DISTRIBUTED PROCESSING; STRUCTURAL ANALYSIS; SYSTEMS INTEGRATION; COMPOSITE STRUCTURES; CRAY COMPUTERS; CYLINDRICAL SHELLS; PANELS; STIFFENING; UNIX (OPERATING SYSTEM); VECTOR PROCESSING (COMPUTERS)...