The VAC should have knowledge of the methods of performing such duties as conducting inspections and investigations, collecting, and analyzing information, etc., and skill in weighing the impact of variables such as critical personnel qualifications, variations in building construction characteristics, access and entry restrictions, equipment availability, and other issues that influence the course of actions taken in resolving security questions and issues. Must demonstrate knowledge of security classification methods, concepts, eligibility for access to classified or sensitive information and the process for granting personnel security clearances/accesses, and knowledge of commonly applied security principles, concepts, and methodologies in carrying out information, personnel, and physical security programs related to the protection of SCI.