... probability assigned for each threat likelihood level is 1.0 for High, 0.5 for Medium, 0.1 for Low • The value assigned for each impact level is 100 for High, 50 for Medium, and 10 for Low. SP ... • The organization’s security policies, guidelines, and standards • Industry practices. The NIST SP 800-26, Security Self-Assessment Guide for Information Technology Systems, provides an ... IT system and its data are, the system and information owners are the ones responsible for determining the impact level for their own system and information. Consequently, in analyzing impact,...