[a] specific level on a hierarchical scale representing successively increased confidence that a target of evaluation adequately fulfills the requirements.[1]
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[t]he Evaluation Assurance Level (EAL1 through EAL7) of an ITproduct or system is a numerical grade assigned following the completion of a Common Criteriasecurity evaluation, an international standard in effect since 1999.[2]
[t]he amount of assurance obtained according to the specific scale used by the assurance method. The amount of assurance obtained generally is related to the effort expended on the activities performed.[4]