1. What are the impacts of homogeneous versus heterogeneous
collaborative learning groups on the performance of high achievement
nine graders in science?
2. What are the impacts of homogeneous versus heterogeneous
collaborative learning groups on the performance of low and
intermediate achievement nine graders in science?
3. What is the effect of homogeneous versus heterogeneous collaborative
learning groups on the attitudes of high achievement nine graders
towards science?
4. What is the effect of homogeneous versus heterogeneous collaborative
learning groups on the attitude of nine graders towards learning
science?
5. Is the effect of homogeneous versus heterogeneous groups merely a
function of the school subject itself or it is influenced by the whole
school environment?
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Worth noting that students’ heterogeneity in this study is unpacked
through two dimensions: the nationality of the students and their
achievement. However, the purpose of the study was not to determine
which nationalities perform better than others or have more positive
attitudes but rather to determine the effects of having mixed nationality
classes on the students’ performance and attitude.