OPA association was established in 2009 by Jelena Bračun Filipovic, Gordana Košćec Bousfield, Ida Loher and Martina Kosec.
Strategija razvoja kreativnosti u osnovnoškolskom i srednjoškolskom odgoju i obrazovanju.
Long-standing project of the OPA association, the Chamber of Architects and the Society of Architects of Zagreb