RESEARCH ON MULTIAGE EDUCATION
Multiage classes during the elementary school years have been an option of educational practice in the United States since the introduction of graded education in the 19th century. Since 1949, several research studies have investigated the relationship between multiage grouping and academic achievement. Reviews of research (Anderson & Pavan, 1993; Pratt, 1986; Gutierrez & Slavin, 1992; Veenman, 1995) reveal inconsistent results. Based primarily on standardized achievement tests, some studies report higher scores for students in multiage classrooms. Other studies favor academic achievement for students in single-age classrooms. More than half of the studies reveal no differences. Veenman (1995) suggests that inconsistencies in research outcomes may be attributed to an inconsistent definition of multiage education. Other researchers (Anderson & Pavan, 1993; Nye et al., 1995; Pratt, 1986) attribute confusion in research outcomes to weak controls for differences between experimental and control conditions and to lack of detail in data analysis-even though experimental studies should be designed to control for these differences. Forced assignment of both students and teachers to multiage classrooms may have contributed to negative academic outcomes in some situations (Slaton et al., 1997). According to Lloyd (1999), the variety of ways multiage grouping is conceptualized and implemented limits the ability of researchers to make generalizations about the academic impact of the multiage model.
Despite inconsistencies in research findings, those studies that report significant achievement outcomes for students in multiage classrooms over those in single-age classes demonstrate gains in language (including vocabulary and literacy measures) and mathematics (Gutierrez & Slavin, 1992; Nye et al., 1995). Advantages have been reported for both high- and low-ability students (Lloyd, 1999; Lou et al., 1996). However, gains are most consistently noted for "blacks, boys, underachievers and students of low socioeconomic status" (Anderson & Pavan, 1993, p. 50). In studies looking at long-term effects, advantages for multiage students have been shown to increase the longer students remain in multiage classrooms. Advantages in the academic realm are supported by consistent reports across studies of specific benefits of multiage grouping in the area of socioemotional development. Students in multiage classrooms demonstrate more positive attitudes toward school, greater leadership skills, greater self-esteem, and increased pro-social and fewer aggressive behaviors, compared to peers in traditional graded classrooms (McClellan & Kinsey, 1999; Veenman, 1995). These variables have been shown to positively influence achievement outcomes in traditional classrooms (Stipek, 1998) and, recently (Kinsey, 2000), in multiage classrooms. In light of consistent positive benefits for multiage grouping in the socioemotional realm, inconsistent outcomes in the academic realm are surprising.
A consistent factor in those studies that show positive achievement outcomes for multiage students over same-age students is the use of a developmentally appropriate approach to teaching, including teaming, cooperative group work, integrated curriculum, and encouragement of interactions among students. Research supports the use of developmentally appropriate teaching practices in producing positive achievement outcomes (Hart, Burts, & Charlesworth, (1997). In addition, a substantial body of research supports the use of cooperative as compared to competitive or individualistic educational efforts. In a synthesis of the results of over 375 studies, Johnson and Johnson (1994) cite evidence that interactive involvement among classmates may be one of the most cost-effective "support systems" for increasing academic achievement (p. 56). According to Slavin (1987), "Under the right motivational conditions, peers can and, more important, will provide explanations in one another's proximal zones of development [as described by Vygotsky], and will engage in the kind of cognitive conflict needed for disequilibration and cognitive growth [as described by Piaget]" (p. 1166). However, Slavin's work demonstrates that peer interaction in and of itself does not enhance learning. Rather, learning enhancement depends on the specific ways that the teacher guides those interactions.
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