Differences between developmentally appropriate and traditional classroom practice include the following: integrated vs. separate curriculum, meaning-driven vs. skill-driven, incidental vs. explicit learning, heterogeneous vs. homogeneous grouping, ready now vs. getting ready, child-centered vs. teacher-directed, autonomy vs. heteronomy, previous knowledge vs. previous skill, thinking vs. practice, human-as-instrument vs. test-as-instrument. (SK)