The International School of Poznan (ISoP) was established by Fundacja International School of Poznan in 2005. On September 1, 2005, the Elementary and Middle School sections opened their doors to the first 34 students. The school was growing fast, reaching 116 students in 2007. In April 2008 the International Baccalaureate Organization (IB) authorized our school to run the IB Diploma Programme. In September 2008 we added two more sections: Gimnazjum (Polish Bilingual Middle School) and the Diploma Programme (High School). The enrollment increased to 347 students that year. In December 2010, our Elementary School section was fully authorized as a Primary Years Programme (PYP) by the IB. The enrollment surpassed 550 in 2016.