Multiage grouping is one way schools can organize around students and their learning. In multiage grouping, students of different chronological ages are intentionally assigned to the same classroom. Multiage grouping may also be called "mixed age." Other terms, such as "nongraded,""ungraded,""multigrade," or "split-grade," are often used interchangeably with mixed-age grouping but can mean different things. This document describes, through a question-and-answer format, what multiage grouping is and how it operates. The following concerns are addressed: the multiage philosophical basis, benefits, patterns of age grouping, the optimal age spread of a classroom, ways in which learning is managed, curriculum, teacher qualifications and needs, resources and instructional strategies, parent involvement, and the amount of time needed for implementation of a multiage program. Characteristics of multiage classrooms include: more positive student attitudes; fewer classroom management problems; yearly continuity; a norm that values each child; cooperative learning; and a family-like atmosphere. Contains a representative list of schools using multiage grouping in the northeast and four references. (LMI)