As a part of the Comprehensive curriculum reform and the “School for Life” project, in the school year 2018-2019, Computer Science became a compulsory subject for 5th and 6th grade students, as well as continued being an elective subject for 7th and 8th grade students. In the meantime, preparations for Computer Science to be introduced as an elective subject in primary schools also continued. The preparation process has finished and Computer Science will become an elective subject in the first four grades of primary school, starting from the school year 2020-2021. The main goal of this thesis was to conduct a research in order to find out whether primary school teachers and Computer Science teachers felt ready to teach Computer Science as a school subject introduced by the Reform. Furthermore, the research also gained insight into how prepared the schools were with regard to the equipment needed for Computer Science classes to take place. The research sample consisted of a hundred (N=100) primary school and Computer Science teachers in the Republic of Croatia. The analysis of the data collected from the research was used to draw conclusions about the technological conditions and difficulties teachers encounter while teaching Computer Science. It has been shown that not all schools have an equally stable Internet connection, as well as that the most common difficulty is the obsolete technology and the lack of computers and space needed for the teaching to take place. A t-test was conducted on the data collected from the research and it has proved that there are no statistically significant differences in the level of readiness before and after the training course with regard to the participants’ teaching experience. Furthermore, the t-test has proved that there are no statistically significant differences in the level of the participants’ readiness to teach Computer Science after the training course with regard to the sex of the participants. Based on the average grade which the participants used to estimate how ready they feel to teach Computer Science (4.23 before and 4.17 after the training course), one can conclude that primary school and Computer Science teachers feel ready to teach Computer Science.