I have been a high school teacher for 20 years, I teach math and ICT in High school Čazma, Croatia. Additionally, I am finishing a doctoral study at Faculty of teacher education, University of Zagreb, Croatia. The doctoral thesis is "Development of the model of computer guided discovery learning by using dynamic geometry software in teaching mathematics" and, as you can assume, this software is GeoGebra. Me and my colleagues created GeoGebra Books for this research and during 2016 the results will be presented to the public.