This document discusses ability grouping in education. It defines ability grouping and describes how students can be grouped either between or within classes based on performance data. Students are taught at a level and pace suited to their ability group. The theory behind ability grouping is that it allows teachers to better meet student needs. While research shows benefits for high-achieving students, it also indicates risks to self-esteem and less effects for middle and lower students. The document concludes by recommending ability grouping if implemented and monitored correctly to improve student learning outcomes.