This had an adverse affect on the Austrian SSN number scheme. The number was your birthday plus 4 digits. In a country with less than 8million people and a func

This had an adverse affect on the Austrian SSN number scheme. The number was your birthday plus 4 digits. In a country with less than 8million people and a functioning healthcare system this works nicely, generates a unique identifier. a lot of software was built around this premise, a government issued, unique identifier. migration brought in people from turkey, which a while ago was one of the countries handing out estimated birthdays. whenever a gov official visited a town, all new babies were registered and got a birthday at the first of the month. boom. the SSN in Austria can no longer be considered unique, but still a lot of newbies fall into this trap. the butterfly effect.