This National Standard of Canada is equivalent to International Standard ISO/IEC 15408-3:1999. This is a text searchable PDF. 1 Scope This part of ISO/IEC 15408 defines the assurance requirements of the standard. It includes the evaluation assurance levels (EALs) that define a scale for measuring assurance, the individual assurance components from which the assurance levels are composed, and the criteria for evaluation of PPs and STs.