The present study was designed to investigate Korean EFL college learners' language development across writing proficiency levels in the ir written productions. For the evaluation of their language development, 18 subsets of the syntactic complexity, accuracy, and fluency (CAF) were used. 86 uni vers ity students participated in the study and wrote narrat ive essays about an assigned topic by using the Criterion®. The writing samples were scored by e-rater® and divided into three different proficiency levels to compare language development among groups. Then their essays were analyzed by us ing L2 Sy ntactical Complexity Analyzel: The findings reveal significant differences in 15 out of 18 measures of CAF and language learners' linguistic developmental patterns across their writing proficiency levels. The results indicate that there are di stinctive features regarding CAF among the three groups. With respect to fluency and accuracy, levels I and 2 showed a similar language developmental pattern, and level 3 was much higher than those groups. In terms of syntactic compl exity, levels 2 and 3 presented a similar developmental pattern, and level 1 was much lower than those groups in general. This study shows the predictive potential of CAF across writing proticiency levels of language learners.

I. INTRODUCTION
II. LITERATURE REVIEW
    1. Complexity, Accuracy, and Fluency (CAF)
    2. Previous Research on CAF
    3. Patterns of L2/FL Writing Development
III. METHODOLOGY
    1. Setting and Participants
    2. Tasks and the Procedures
    3. Measures and Dependent Variables
    4. Analysis
IV. RESULTS AND DICUSSION
v. CONCLUSIONS
REFERENCES

• Eunkyung Hwang(Dept. of English Language and Literature Sookmyung Women's University)