An assessment of a safeguards system to determine the degree of its vulnerability to attacks by potential adversaries attempting to alter, remove or replace the genuine data handled by the system, or to gain unauthorized access to the data. Vulnerability assessments for IAEA equipment systems operating in an unattended mode are often performed by third-party laboratories. Tampering - Interference in an unauthorized and undeclared manner to defeat the integrity of C/S or other safeguards equipment. Tamper indication - Physical evidence of tampering with C/S or other safeguards equipment.