Marginal: injury causing lost workdays, reversible moderate environmental impact, minor accident damage level.Critical: accident level injury resulting in hospitalization, permanent partial disability, significant reversible environmental impact, damage to equipment.Catastrophic: death or permanent total disability, significant irreversible environmental impact, total loss of equipment.For example, the harm severity can be categorized as: US DoD, NASA, ISO), individual projects and organizations may need to create their own or tailor an existing risk matrix. In practice, the risk matrix is a useful approach where either the probability or the harm severity cannot be estimated with accuracy and precision.Īlthough standard risk matrices exist in certain contexts (e.g. Statistically, the level of downside risk can be calculated as the product of the probability that harm occurs (e.g., that an accident happens) multiplied by the severity of that harm (i.e., the average amount of harm or more conservatively the maximum credible amount of harm). Risk is the lack of certainty about the outcome of making a particular choice. This is a simple mechanism to increase visibility of risks and assist management decision making. Risk assessment comparing the likelihood of a risk to its severityĪ risk matrix is a matrix that is used during risk assessment to define the level of risk by considering the category of probability or likelihood against the category of consequence severity.
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