Schools need to address the needs of their students with high ability. Not only does this raise achievement levels schoolwide, it also attracts students from surrounding districts and recaptures advanced learners who left the school because their needs weren't being met. One practical intervention--cluster grouping--provides an inclusive environment that takes into account the needs of advanced learners. In cluster grouping models, all students in a grade level are grouped according to their ability and achievement levels. A cluster of either gifted or high-achieving students--one or the other--is in every classroom, along with only two or three other clusters. These remaining clusters are composed of students in the average, low-average, and far-below-average ranges. Cluster grouping makes teaching in classes with a range of abilities more manageable and more successful. (Contains 1 figure.)