THE FIRST PAPER UNDERSCORES THE THREAT POSED TO NUCLEAR SECURITY BY INSTITUTIONAL INERTIA AND RESISTANCE TO CHANGE COMMON TO THE AVERAGE GOVERNMENT AGENCY, WITH ATTENTION TO PERSONNEL SECURITY CLEARANCE, ND SECURITY AND RESEARCH VULNERABILITIES AND LIMITATIONS, MANAGEMENT MOTIVATION, MILITARY POLICIES, AND ARGUMENTS IN SUPPORT OF A CONTINUING PROGRAM OF PENETRATION TESTING BY SELECTED TEAMS OF SPECIAL FORCES TROOPS. A CONCEPTUAL FRAMEWORK FOR REALISTICALLY ASSESSING THREATS TO THE COMMERCIAL NUCLEAR INDUSTRY IS PRESENTED IN THE SECOND PAPER. THIS METHODOLOGICAL FRAMEWORK IS DESIGNED TO AID RESEARCHERS AND POLICYMAKERS IN DETERMINING, AMONG OTHER THINGS, THE IDENTIFIABLE CHARACTERISTICS OF GROUPS INTERESTED IN NUCLEAR FACILITIES AS TARGETS OR SOURCES OF WEAPONS AND THE COURSES OF NUCLEAR ACTION LIKELY TO TO BE PURSUED. NEXT, SOME CROSS-NATIONAL COMPARISONS OF TERRORIST BEHAVIOR AND MISBEHAVIOR ARE NOTED. TERRORIST CHARACTERISTICS AND A MODEL OF TERRORIST ORGANIZATION AND OPERATION ARE DISCUSSED. THE ATTRIBUTES OF POTENTIAL ADVERSARIES TO U.S. NUCLEAR PROGRAMS ARE THEN EXAMINED. RESEARCH BASED ON AN INVESTIGATION OF SEVERAL HUNDRED INCIDENTS WHICH INVOLVED ACTIVITIES THAT COULD SERVE AS ANALOGS OF POTENTIAL THREATS IS REVIEWED. ANOTHER PAPER PRESENTS SOME IDEAS ON STRUCTURING THE PROBLEM OF COLLUSION WITH THE OBJECTIVE OF PROVIDING A CURSORY INVESTIGATION OF THE VULNERABILITY OF A FACILITY TO COLLUSION FROM MEMBERS OF THE SECURITY FORCE. THE COMPLEX PROBLEM OF RESPONSE FORCE SELECTION, TRAINING, AND MOTIVATION IS ADDRESSED IN THE FOLLOWING PRESENTATION, WITH ATTENTION TO BOTH THE GOVERNMENT AND PRIVATE SECTOR ROLE IN NUCLEAR SECURITY. NEXT, THE USE OF ANIMAL SENSORY SYSTEMS AND RESPONSE CAPABILITIES IN SECURITY SYSTEMS ARE EXAMINED. AERIAL, TERRESTRIAL, AND AQUATIC SYSTEMS ARE DISCUSSED, AS ARE DESIGN CRITERIA FOR PRACTICAL BEHAVIORAL SYSTEMS. RESEARCH IN PROGRESS AND THE POTENTIAL APPLICATIONS OF PHYSIOLOGICAL PSYCHOLOGY REGARDING THE CORRELATES OF INFORMATION PROCESSING LOAD ARE DISCUSSED IN THE NEXT PAPER. THE PROCESS OF IDENTIFYING HUMAN FACTOR PROBLEMS FOR MILITARY COMMAND, CONTROL, AND COMMUNICATIONS SYSTEMS; THE NATURE OF BIOCYBERNETIC EXPERIMENTATION AND APPLICATION; AND HOW PHYSIOLOGICAL PSYCHOLOGY METHODS MIGHT BE APPLIED TO SECURITY PROBLEMS ARE EXAMINED. FINALLY, REQUIREMENTS FOR A COLLECTION OF CRITICALLY EVALUATED ERGONOMICS DATA ARE OUTLINED. A MODEL SYSTEM IS NOTED, AND THE FUNCTIONAL REQUIREMENTS OF AN ERGONOMICS DATA COLLECTION, USERS AND USER NEEDS, DATA ANALYSIS CENTERS, NEW DATA SOURCES, STANDARDS, AND THE APPLICATION OF AN ERGONOMICS DATA SYSTEM FOR PHYSICAL SERUCITY ARE DISCUSSED. AN OPEN DISCUSSION SESSION WAS INCLUDED AT THE END OF THE FIRST DAY OF THE SYMPOSIUM, AND A PANEL DISCUSSION DEVOTED TO A SYNTHESIS OF THE MATERIAL AND A DISCUSSION OF FUTURE RESEARCH DIRECTIONS WAS HELD AT THE CLOSE OF THE SECOND DAY. NOTES FROM BOTH ARE PROVIDED. GRAPHIC AND TABULAR DATA ARE INCLUDED, AS ARE REFERENCES WHERE APPLICABLE.