The education system in the Republic of Croatia consists of preschool education, primary education, secondary education, higher education and lifelong learning, that is adult education. The educational system is constantly being updated in order to improve its overall mobility and to encourage all citizens to lifelong learning. Every man in the course of his life spends at least eight years studying in educational and educational institutions. In fact, in every activity he is exposed to various dangers and harms to his health. The unfavorable impact of the working environment on a person results in his illness and / or unsafe work environment, while the consequence of disturbances in the relationship between man and the working environment is most often an injury at work. The planned and expected balance of man and the working environment in the work process is disturbed by inappropriate or incorrect work procedures or incorrect means of work. According to the data of the Clinic for Children's Diseases Zagreb, a dozen children with serious injuries caused on children's playgrounds are admitted daily. If we multiply this number by 30 days a month, calculating that the "season" of playing on outdoor play-grounds lasts at least six months a year, we will get 1,800 injuries a year in the Croatian capital alone. "Apart from the fact that there are no unique statistics on how many injuries occur on playgrounds, we do not know how many playgrounds there are in Croatia, where they are, what age, what equipment," said playground safety specialist Marinko Kramaric, who has worked at the Center for eight years for quality and safety in Zagreb.