This study aims to identify the most effective strategy to improve writing quality and quantity by
comparing the effects of three different writing strategies to the children at-risk for learning
disability. Different writing instructional strategies are Self-regulation centered ‘주장쓴글’, Graphic
organizer and Study of Model strategy. Results of the study show that all of three writing
instructional strategies were effective to improve quality and quantity of the children at-risk for
learning disabilities and self-regulation centered ‘주장쓴글’ was the most effective strategy. This
strategy showed obvious improvement of quality(contents creation, structure, expression, formality and
grammar) and quantity. Effectiveness of strategy was generalized by showing improvement of quality
and quantity of writing diary which is different genre of writing from that of 1st and 2nd
treatment. Maintenance evaluation was carried out 40 days after completion of treatment and
evaluation and it showed that effectiveness was maintained