The event will introduce the concepts that underline the evaluation of preventive and protective measures and explain how these should be applied to enhance nuclear security with regard to insider threats.The event is designed for participants working in nuclear materials security or nuclear safeguards, in Government ministries, regulatory bodies, law enforcement agencies or operating organizations. The event is intended mainly for persons who are responsible for designing, operating and/or assessing nuclear security systems, including the nuclear material accounting and control (NMAC) components, as well as physical protection measures at nuclear facilities; nuclear security management and staff; operators and managers of NMAC systems; those who prepare associated regulations; persons responsible for computer security at nuclear facilities; and persons from the competent authorities and related law enforcement agencies. Event is open to 40 participants and is held a few times per year.