Establishing Guidelines for MLU Measurement in an Agglutinating Language: An Illustration of Georgian

This article explores the applicability of mean length of utterance (MLU) as a language assessment measure for Georgian child language, as to-date, Georgian, a morphologically rich language with numerous inflectional categories, experiences an extensive lack of instruments for early language assessment. To this end, a set of guidelines for calculating Georgian MLU was developed based on the analysis of a longitudinal corpus of two Georgian-speaking children aged 12-35 months. This was supported by the findings of previous studies on Georgian acquisition. Furthermore, the guidelines were used to compare MLU in morphemes (MLU-m) with MLU in words (MLU-w) and MLU in syllables (MLU-s) to determine the most suitable method for assessing morphological development in Georgian. These results indicate that MLU-m closely aligns with the description of language development in Georgian children. MLU-s is useful for demonstrating early linguistic development, while MLU-w correlates with age but does not capture changes within words over time. Further testing on a larger corpus is needed to refine the guidelines for more accurate assessment of Georgian-speaking children.