Sona Ceretkova is associate professor of mathematics education in the Department of Mathematics, Faculty of Natural Sciences, CPU Nitra. She is experienced team leader of national and international projects in mathematics and science education, co-author of textbooks of mathematics for lower secondary school and organizer and lector of courses of professional development of mathematics teachers. She works as regional expert in Mathematics Olympia competition and national contact person for contests Mathematics B-day and IMMC. She is supervisor of PhD students of Theory of Mathematics Education; Faculty of Natural Sciences Scientific Board member and ICMI Slovakia representative. The main focus of her research is inquiry-based education in mathematics, interdisciplinary and didactical principles of mathematical tasks and teachers’ education and evaluation of teachers’ competences.