Contestants Of Beauty Pageant, Miss Universe 2011, São Paulo, Brazil

The competition for the Miss Universe title has seen many changes, although there have been several constants throughout its history. All the contestants compete in a preliminary round of judging (nowadays called the "Presentation Show") where the field is narrowed to a select number of semi-finalists. This number has fluctuated over the years. The very first Miss Universe pageant had ten semi-finalists. The next two years, the number of semi-finalists grew to 16. In 1955, the number dropped to a stable 15, which remained through 1970. In 1971, the number was reduced to 12. That number was further reduced to a mere 10 in 1984. This lasted until 2003, when the number of 15 was re-instated. In 2006, there were 20 semi-finalists, the highest number ever. In 2007, the Organization announced the Top 15 system would be back, which was also used in 2008.
In the early years, the contestants were judged in swimsuit and evening gown only. In later years, the contestants also competed in a preliminary interview round in a one-on-one meeting with each individual judge.