Information technology risk, IT risk, IT-related risk, or cyber risk is any risk related to information technology. While information has long been appreciated as a valuable and important asset, the rise of the knowledge economy and the Digital Revolution has led to organizations becoming increasingly dependent on information, information processing and especially IT. Various events or incidents that compromise IT in some way can therefore cause adverse impacts on the organization's business processes or mission, ranging from inconsequential to catastrophic in scale. Assessing the probability or likelihood of various types of event/incident with their predicted impacts or consequences, should they occur, is a common way to assess and measure IT risks. Alternative methods of measuring IT risk typically involve assessing other contributory factors such as the threats, vulnerabilities, exposures, and asset values. Definitions ISO IT risk: the potential that a given threat will exploit vulnerabilities of an asset or group of assets and thereby cause harm to the organization. It is measured in terms of a combination of the probability of occurrence of an event and its consequence. Committee on National Security Systems The Committee on National Security Systems of United States of America defined risk in different documents: From CNSS Instruction No. 4009 dated 26 April 2010 the basic and more technical focused definition: Risk – Possibility that a particular threat will adversely impact an IS by exploiting a particular vulnerability. National Security Telecommunications and Information Systems Security Instruction (NSTISSI) No. 1000, introduces a probability aspect, quite similar to NIST SP 800-30 one: Risk – A combination of the likelihood that a threat will occur, the likelihood that a threat occurrence will result in an adverse impact, and the severity of the resulting impact National Information Assurance Training and Education Center defines risk in the IT field as: The loss potential that exists as the result of threat-vulnerability pairs. Reducing either the threat or the vulnerability reduces the risk. The uncertainty of loss expressed in terms of probability of such loss. The probability that a hostile entity will successfully exploit a particular telecommunications or COMSEC system for intelligence purposes; its factors are threat and vulnerability. A combination of the likelihood that a threat shall occur, the likelihood that a threat occurrence shall result in an adverse impact, and the severity of the resulting adverse impact. the probability that a particular threat will exploit a particular vulnerability of the system.