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Table 6Frequency and consequence of failure mode categories and safeguard effectiveness categories

CategoryFrequencyDescription
F1RemotePossible, no known data (happens once in 10 years)
F2UncommonDocumented but infrequent (happens once a year)
F3OccasionalDocumented and frequent (happens once a month)
F4Very frequentDocumented, occurs routinely (happens more than once a month)
CategoryConsequenceDescription
CP0NoneNo impact on the chance of failure mode
CP1LittleLittle impact on the chance of failure mode
CP2SomeSome impact on the chance of failure mode
CP3SignificantSignificant impact on the chance of failure mode
CP4CertainAlmost certain chance of failure mode
CategorySafeguard TypeDescription
S1Multiple checksHospital procedure has a formal built-in check and other safeguards
S2Formal checkHospital procedure includes a formal built-in check
S3Standard practiceStandard practice includes a check
S4NoticeableWorker notices and responds
S5NondetectableThe failure is not detectable

From: Leveraging Existing Assessments of Risk Now (LEARN) Safety Analysis: A Method for Extending Patient Safety Learning

Cover of Advances in Patient Safety: New Directions and Alternative Approaches (Vol. 1: Assessment)
Advances in Patient Safety: New Directions and Alternative Approaches (Vol. 1: Assessment).
Henriksen K, Battles JB, Keyes MA, et al., editors.

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