The heterogeneity factor had a negative effect on the achievement of the
students. The students in the mixed ability classes scored less than the
students in other groups. However, when the “same ability” groups
contained students from different cultural backgrounds, the results were
the most favorable.
The optimum class composition that may yield best achievement results
and constructs positive attitudes is a compromise that maximizes group
diversity and prevents individual isolation. The interaction between the two
factors (ability + multiculturalism) gives the best desired results. In
multicultural classes, collaborative learning should be supported by a
multicultural education program, otherwise it would have little if any
positive effect on the students achievement and attitudes towards learning
science.