Articulatory variability is a phonological characteristic that can be observedfrequently from young children in early stage of phonological acquisition process.It is also a characteristic that gradually disappear through progress of phonemelearning by age (Sosa & Stoel Gammon, 2006). If it occurs with high ratio of undevelopmentalerror pattern during long periods prominently, not appearingduring developmental error acquisition process, children can be diagnosed asspeech sound disorder such as childhood apraxia of speech(CAS; AmericanSpeech Language Hearing Association[ASHA], 2007) and inconsistent disorder(Dodd, 2005). Therefore, classifying characteristic of variability on normal children and inconsistency of disorder diagnosis sign and studying aboutcharacteristic of articulatory variability on normal children will help onunderstanding of articulatory variability.According to many researches about variability, it is reported that childrenbefore 50-word stage, early stage of phonological acquisition process, have highvariability in speech sound production. Also variability from normal childrenduring that period can be found in phonological system elements like consonantand word structure, but this occurs due to incompletion of the process. Childrenfrom 18 months to 36 months are reported to show extreme variability forapproaching adult phonological model as much as they can. In other word, it hasbeen reported that pronunciation from around 2 years old children in early stageof phonological development has high variability.Pervious domestic articulatory variability research was conducted mainly noton spontaneous conversation of children but on word level. Most of researchesevaluated variability only on word level without reflection of information aboutphonological variability. It is pretty rare to find research about 2 years oldchildren predicted to have the most variability. Therefore this research is goingto study on word variability and phonological variability of 24-36 monthschildren thought to have high variability due to incompletion of phonologicalacquisition.This study targets were 22 children whose ages are 24-36 months andconfirmed as normal development. The grout was divided into 24-30 monthsgroup and 31-36 months group to compare about their development. Data wasgathered by visiting target children's family and collecting of spontaneous utterances for 30 minutes. During data collection, parents and inspectorinteracted with children freely using the same toy. Through recording data andvideo data, sample of spontaneous utterances of children was phonetictranscripted. Based on the transcripted data, percentage of correct consonant,consonant inventory, phonological variability and word variability were analyzed.Analysis, based on 30 minutes of sample of spontaneous utterances datafrom children, to measure word variability was conducted by Eojeol. Sample ofspontaneous utterances of children was categorized omission, substitution,addition and distortion error as articulation error. Measured value of articulatoryvariability was designed based on measuring method from Dodd(1995) to find outoverall variability including correct articulation and articulation error of normalchildren on spontaneous conversation. To find out differences of word variabilityand phonological variability due to age, t-test was conducted on independentsample and Pearson correlation analysis was conducted to find out correlationamong percentage of correct consonant, consonant inventory, word variabilityand phonological variability.As a result of independent sample t-test, word variability and phonologicalvariability in both groups are different significantly. Both word variability andphonological variability seemed to appear more in 24-36 months children than31-36 months children. Children seemed to have consistent articulation in wordand phonemes by age increase. From the result of Pearson correlation analysis,word variability and phonological variability seemed have negative correlationwith percentage of correct consonant and consonant inventory. In other word, itseemed that the lower the word variability and phonological variability, the higher the speech development measures such as percentage of correctconsonant and number of consonant inventory.It appeared that word variability and phonological variability in case of 31-36 months children are lower significantly than of 24-30 months children, withgradually consistent articulation, which seems to be because of maturation ofphonological system and articulation organ's movement control ability. Alsogeneral development pattern of articulatory variability seems to decrease byincreasing percentage of correct consonant and number of consonant inventory.This research suggested phonological characteristic that children around 2years old show stable and consistent articulation pattern due to rapidadvancement of phonological acquisition. This result can be used to compare andevaluate degree of articulatory variability on children who have inconsistentphonological disorder or childhood apraxia of speech more objectively.