The motor speech assessment is a part of the speech and language pathologist's assessment that contributes to the overall assessment of the child's speech and motor skills as well as differential diagnostics. One of the most important speech motor tasks is diadochokinesis (DDK), also known in the literature as maximum repetition rate (MRR). DDK or MRR is task that involves repetition of one, two or three different syllables as quickly and as precisely as possible, and the literature divides it into repetition of a monosyllabic structure (Alternate Motion Rates - AMR) and repetition of a polysyllabic structure (Sequential Motion Rate - SMR). Due to the simplicity of application and great contribution in scientific and practical work, DDK is a frequently used motor speech measure. The task consists of repeating one, two or three different syllables composed of consonants /p/, /t/ and /k/ and vowels as quickly and accurately as possible. These consonants were chosen due to their presence in most languages (Schwartz et al., 2012), which allows almost universal application of the task (Kent et al., 2022). In addition, the consonants /p/, /t/ and /k/ and vowels were chosen because children acquire them early (McLeod & Crowe, 2018). Despite the fact that the same consonant-vowel syllables (pa, ta and ka) are most often used for the DDK task, intra- and inter-linguistic comparison of the results is usually not possible due to the implementation of different research methodologies, which is why equality in terminological and methodological terms is something that is necessary and what is aspired to today. In this study, 89 typically developing preschool children from Zagreb were tested with a DDK protocol as part of the test battery for assessing speech production - The Computer Articulation Instrument (CAI). Children aged 3:00-7:00 were examined. By conducting non-parametric statistical tests, several results were found. In accordance with the research in other languages, it has been shown that children are more accurate and faster in the production of DDK with increasing age. Also, it turned out that the syllable /pa/ is the fastest pronounced monosyllabic syllable. The aforementioned findings support the data on nonlinear neuromotor development. Furthermore, this research showed that trisyllabic structures are the slowest produced structures. In further research, it is necessary to include a larger number of respondents from all parts of the Republic of Croatia.