VSA, or Visnjan School of Astronomy, is a summer workshop of astronomy located in the Visnjan Observatory, situated in the western part of the Istrian highlands, near the city of Porec, Croatia. It represents a continuing experiment in an attempt to merge scientific projects and high school students education. Students are treated like research colleagues in the scientific process. Created in the Visnjan Observatory, VSA represents the result of many years' efforts of its organizers and founders. Twenty years till now VSA has been combining scientific work with learning, and throughout the years many scientific moments occurred, eg. discovery of 2003QA asteroid.