This book addresses I. Effects of Learning Environment Differences (On and Offline vs. Offline) on Intermediate Level Learners' Writing Development, II. A Study of the Effect of a Medium of Instruction on the East Asian Students' Writing Development, and III. Effects of Instructional Hour Intervals on the Dynamic Written Corrective Feedback (DWCF). The researcher asks how WCF works when intermediating variables are interacting with each other.