TRESS 90 (1990–1996) was a Norwegian software project meant to be the replacement for INFOTRYGD, a case-worker support system, used by the Norwegian National Insurance Service.
Due to administrative, political, organizational and technical problems, including extreme cost overruns, the project was eventually abandoned with a total pricetag of 1,2 billion kr ($200m).
It is still the largest IT failure in Norwegian history.
References
Tress 90 Wikipedia(Text) CC BY-SA