The article discusses the importance of cyber security controls in nuclear power plants to prevent cyber attacks. The researchers developed a technical assessment methodology (TAM) to evaluate the effectiveness of security controls. By comparing results from using NEI 13-10 alone versus NEI 13-10 and TAM together on a nuclear power reactor system, they found that TAM provides a more comprehensive assessment of security risks and control effectiveness. This methodology helps identify and mitigate potential cyber threats more effectively in nuclear power plants.