University rankings have become a prominent issue in an increasinglycompetitive world of higher education. Although a positive view of rankings is not unanimously shared, the number of meetings and referencesto ranking of higher education confirms a wide interest and attention tothis phenomenon. This paper discusses the different instruments used forbuilding university rankings and proposes a new methodology that involves simulation techniques allowing ranking universities in a robust way.The immediate benefit achieved is a reduction of the uncertainty associated with the assessment of a specific rank which is not representative ofthe real performance of the university, and an improvement of the qualityassessment of composite indicators used to rank.