Abstract
To meet the quality requirements in Norway a new concept for national collection and reporting of fault and interruption data is developed in the 1990's. This concept is denoted FASIT and has been in use by the Norwegian power industry since 1995. It provides data for a number of purposes related to planning and operation of power systems, as well as data for the monopoly control. The background and structure of FASIT is thoroughly described In the paper, together with some experience gained through full-scale use of the system for 4-5 years. The main challenges have been to harmonise the interpretation rules and quality standards between data collectors and companies, and dealing with changes in the requirements, definitions and software versions. Some recommendations for similar data collection projects or systems are given