Definition: Ability grouping is the placement of children in one classroom into groups based on their ability. The classroom may contain children with a wide range of ability. Children can move in and out of groups as needed. For example, a child may be in the high ability group in reading, but a middle level in math. If the child improves in math, he could be moved up to the high ability in math. In the same way, if the child begins to have problems in reading, he could be moved to a lower group. This flexibility of grouping allows the needs of children to be better met. Ability grouping is not the same as tracking, heterogeneous grouping, or cluster grouping.