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They are all considered as unique identifiers and they can be used to single out the individual, as long as it is possible to link them to a reference database (e.g. linking an ID card to a particular person). For example, when identification is performed using only one of these numbers:

• EI=0,25 (Negligible) when no other information is provided about the individual or it is not possible to find additional information unless access to the reference database is obtained
• EI=0,75 (Significant) when the identifier reveals additional identification information about the individual (e.g. social security number revealing date of birth) and is linked to other data (e.g. postal address or email).
• EI=1 (Maximum) when information from the reference database is also available (e.g. ID card and full name and/or picture).