ENThis study introduces a Lithuanian non-word repetition test and explores methodological issues by comparing two stimuli presentation conditions (live mode vs audio mode). The study aims to discuss methodological issues of the non-word repetition test and its potential consequences for the results. The study sample comprises 100 typically developing children (2 age groups: 4;00–4;11 and 5;00–5;11). The inquiry assessed the impact of presentation mode on the accuracy of the task performance, focusing on the effect of age. The comparison of the different stimuli of the non-word repetition test indicates that the mode of presentation impacts the accuracy of the test results. The study showed that observing the target’s visual articulation helped children identify the non-words: performance in the live presentation mode was more accurate than with audio-recorded stimuli, particularly by the group of older children. Regardless of the stimuli and age, an overall comparative analysis confirmed the tendency for non-word repetition accuracy to decline in longer and structurally more complex words. Keywords: first language acquisition; non-word repetition test; speech perception; experiment; Lithuanian. [From the publication]