THE AEROSPACE VEHICLE SYSTEMS INSTITUTE (AVSI) HAS BEEN CONDUCTING COOPERATIVE RESEARCH WITH LEADING U.S. AND INTERNATIONAL AIRCRAFT MANUFACTURERS SUBSYSTEMS SUPPLIERS THE FEDERAL AVIATION ADMINISTRATION AND THE DEPARTMENT OF DEFENSE CONCERNING THE ADVANCEMENT OF VIRTUAL INTEGRATION OFCOMPLEX SYSTEMS. THE OBJECTIVE OF THE SYSTEM ARCHITECTURE VIRTUAL INTEGRATION (SA VI) PROGRAM IS TO SIGNIFICANTLY REDUCE THE NUMBER OF ERRORS DISCOVERED DURING THE INTEGRATION PHASE OF SYSTEM DEVELOPMENT. SUCH ERRORS HAVE SIGNIFICANTLY CONTRIBUTED TO THE DRAMATIC INCREASES IN BUDGET AND SCHEDULE OVERRUNS SUFFERED BY MAJOR COMMERCIAL AND MILITARY DEVELOPMENT PROGRAMS. NASA PARTICIPATION IN THE SA VI PROJECT IS WARRANTED FOR SEVERAL REASONS. FIRST NASA WILL BE SUPPORTING THEIR MISSION TO IMPROVE AIRCRAFT SAFETY BY IMPROVING THE METHODS USED TO DESIGN COMPLEXSYSTEMS. SECOND NASA'S PARTICIPATION FOSTERS SUPPORT FOR A STANDARDS-BASED COOPERATIVE SOLUTION TO A PROBLEM SHARED BY ALL STAKEHOLDERS IN THE AEROSPACE INDUSTRY. FINALLY PARTICIPATION IN THE AVSI SAVI PROGRAM REPRESENTS A GOOD VALUE FOR NASA ENABLING $9 OF MISSION-SUPPORTING RESEARCH FOR EACH $1 INVESTED. THIS PROPOSAL DESCRIBES THE WORK TO BE PERFORMED IN NEXT PHASE OF THE SA VI PROGRAM UNDER AFE 61S1. THE FOCUS OF WORK IN THIS AFE IS (A) CONTINUING TO MATURE THE SAFETY ANALYSIS PROCESSES DEVELOPED UNDER AFE 61; (B) CONFIGURE AND EXTEND AN ISO 10303-239 (PRODUCT LIFE CYCLE SUPPORT) DATA EXCHANGE SPECIFICATION (DEX) FOR THE SAVI VIP AND DEMONSTRATE MODEL DATA EXCHANGE BETWEEN TWOOR MORE ANALYTICAL TOOLS IN THE SAVI VIP FRAMEWORK; (C) AND EXTEND THE SAVI VIP TO ENABLE MECHANICAL/SPATIAL INTERFACE CONSISTENCY ANALYSIS AND BEHAVIORAL (TEMPORAL) CONSISTENCY ANALYSIS. THIS WORK REPRESENTS A NATURAL EXTENSION TO PART OF THE NASA TECHNICAL WORK CONTRIBUTED IN THE PREVIOUS PHASE. THE SA VI PROJECT WILL ALSO CONTINUE TO REACH OUT TO WORK COOPERATIVELY WITH RELATED RESEARCH EFFORTS AND WITH COMMERCIAL TOOL VENDORS TO AVOID DUPLICATION OF EFFORT AND ACHIEVE AN INDUSTRY-SUPPORTED SOLUTION.