A Study of Differentiated Instructional Change over 3 Years.

This study examines Title 1 heterogeneous classroom teachers' instructional behavior change through implementing well-designed research-based curriculum units and attending regular professional development activities across 3 years. Employing an experimental design, this study compares experimental and comparison teachers' behavioral changes as measured by an observation scale of differentiated teaching strategies across 3 years. The results show that experimental teachers received statistically significant and educationally important higher ratings than comparison teachers on differentiated strategy use and effectiveness across 3 years. The study corroborates the research literature that shows that teachers' instructional improvement takes 2 years to manifest its effectiveness and to shape belief in student learning benefits.Putting the Research to Use: This study suggests several areas of practical application. One area is in the reality versus the myth of professional development. These data suggest th...