The results indicated significant improvement in the achievement of the experimental group versus the control group. (edutopia.org)
When the cluster group is kept to a manageable size, many cluster teachers report that there is general improvement in achievement for the entire class. (hoagiesgifted.org)
And if this is what it takes to make modest improvements in achievement levels and reduce achievement gaps, how often can we expect it to happen? (educationnext.org)