This paper investigates the issues that arise from using sounds /č/ and /ć/ in writing. Native speakers of Croatian language very often tend to confuse them in speech and mix them in writing. The reason for this is due to the very similar way these voices are articulated, this also happens with certain dialects or local speeches which are known for confusing mentioned sounds. To this problem also contributes the fact that the occurrence of sounds /č/ and /ć/ in Croatian language is not frequent. By observing issues of equalization and non-equalization of these sounds we come across two different theses. Škarić insists on equalization of sounds /č/ and /ć/ to sound /č/. On the other hand, Brozović explains phonological obstacles which incorporate sounds /č/ and /ć/ as two different sounds. Heart of this paper is the research conducted to investigate the level of mastery of orographic norm in using sounds /č/ and /ć/. The research included 90 examinees belonging to different departments attending the University of Zadar. The Method used to conduct this research was a questionnaire. The questionnaire included 30 occurrences of grapheme č, as well as ć. Results were analysed by taking into account the department the examinee belongs to: philological group and other groups, Croatian studies and other philology (within philological groups). The aim of this research was to establish to what extent do examinees follow the rules, or violate the orthographical norm in occurrences of sounds /č/ and /ć/. The purpose of this research was to point out the most frequent deviations in all the groups and to check whether the examinees use orography rules when encountering linguistic dilemmas caused by these sounds. Focus is placed on examinees and the attitude they have towards the orthographic norm, equalization and non-equalization of these sounds. The results of the research showed that examinees make most mistakes when it comes to occurrences containing the grapheme /č/. The most significant deviation was found in occurrences containing the grapheme /č/ when it is a part of nominal suffix -ica. Examinees belonging to Kajkavian speaking region tend to make more mistakes while writing these sounds compared to examinees coming from Shtokavian and Chakavian speaking regions.