Unique identifiers

Unique identifiers is a term used for unique information that appears in the gathered documentation of the person whose age is the subject of the conducted study that helps to identify that the person alive 110+ years later is the same as the person in the original document. This information may consist of, e.g., names of the parents, siblings and, in some cases, grandparents, place of residence, place of birth, date of birth, dates of other event during the person's life, name of the spouse and children, date of marriage, date of immigration, if concerns and date and place of death. In other words, unique identifiers are the factors which are responsible for the determination of the consistency of the entire case documentation, thus confirming that the gathered evidence, regardless from the time of its issue, concerns one and the same person.