ATTACHMENT: INFORMATION SHARING TO NISC AND INFORMATION SHARING FROM NISC 1. Information Related to System Failures Considering that the affected area and incident response activities are different depending on the severity of CISs outages and the importance of related information, severity schema on CISs outages are established as follows and concrete discussion is to be commenced with the aim of ensuring sharing of awareness among stakeholders and enabling quick decision making on incident response. Table. Severity Schema on CISs Outages (draft) Severity Definition Level 5 Poses an imminent threat to wide-scale critical infrastructure services Emergency Level 4 Likely to result in a significant impact on critical infrastructure services Severe Level 3 Likely to result in a demonstrable impact on critical infrastructure services High Level 2 May affect critical infrastructure services Medium Level 1 Unlikely to affect critical infrastructure services Low It is expected that stakeholders' efforts for information sharing and incident responses based on the abovementioned severity schema will clarify and deepen their understanding of shared information and assist their efficient and effective activities. 49