Richard Bruton (Dublin Bay North, Fine Gael) | Oireachtas source

It is the unique identifier we use in the database for identifying pupils. It is inherent in the whole data collection process. By introducing it in primary legislation, we comply with data protection and it can only be used for the purposes specified. By introducing it in primary legislation, we give people the protection the Data Commissioner requires. However, it is the unique identifier the Department uses in all its operations.