Modern technologies influence changes and developments in society daily, which has also affected the educational system. In this context, this paper attempts to explore the concept of technology in education, looking at ICT in education, including classrooms, teachers, students, parents, SRCE and CARNet, and most importantly, e-Dnevnik on which the work is based. Since e-Dnevnik has been used for many years, there is experience in the operation and use of the system. The paper examines the experiences of teachers, parents, and students in various educational institutions in Koprivnica-Križevci County. The analysis of the data showed that most teachers, parents, and students are very satisfied with the application and use it every day. It highlights the greater number of advantages of the application over the disadvantages of the classic, paper version of the class book, such as constantly upgrading and improving the application in accordance with user needs. The disadvantages of the application stem from external factors such as inadequacy of equipment and instability of the Internet connection. Also, there is a lack of inadequacy of the system in institutions for the upbringing and education of children with special needs. According to the stated advantages, e-Dnevnik has justified its implementation in most educational institutions and practices. On the other hand, there is enough space for improvement and modifications within the application to modernize the education system and adapt to individual situations and institutions.