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A nongraded elementary program is one in which children are flexibly grouped according to performance level, not age, and proceed through the elementary school at their own rates. Popular in the 1950s, 1960s, and early 1970s, the nongraded plan is returning today. This article reviews research on the achievement effects of nongraded organization. Results indicated consistent positive achievement effects of simple forms of nongrading generally developed early: cross-grade grouping for one subject (median ES = + .46) and cross-grade grouping for many subjects (median ES = + .34). Forms of nongrading making extensive use of individualization were less consistently successful (median ES = + .02). Studies of Individually Guided Education (IGE), which used nongrading and individualization, also produced inconsistent effects (median ES = + .11). The article concludes that nongraded organization can have a positive impact on student achievement if cross-age grouping is used to allow teachers to provide more direct instruction to students but not if it is used as a framework for individualized instruction.
Gutiérrez et al. (Tue,) studied this question.