CL Item
Exact match on SSN, first name, middle initial, last names, sex, state of birth, birth month and birth year (1)
CL Item
SSN matches on at least seven digits and one or more of the other items from Class 1 may or may not match (2)
CL Item
SSN unknown but eight (items) or more of first name, middle initial, last name, birth day, birth month, birth year, sex, race, marital status, or state of birth match (3)
CL Item
Same as Class 3 but less than eight items match (4)
CL Item
SSN is known but does not match (5)