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The notion of levels of assurance applying to attributes has been recently challenged (see http://blog.idmanagement.gov/2012/03/to-loa-or-not-to-loa-for-attributes-not.html ) since the measure of confidence/level of confidence one can have in an attribute (and how that is determined) is likely to be different than the generally understood notion of Level of Assurance which derived form from the context of OMB -04-04 and NSIT SP-800-63. Work needs to be done to resolve any further confusion or misunderstanding through defining the components that constitute this 'LoC', and to confirm the need to differentiate this context from the context of identity proofing and credential strength that is applied to 'LoA' of identity.
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