Heterogeneous means a mixture or variety of different things. It is used to describe a group or collection that is made up of diverse or dissimilar components. Full definition
a nongraded, schools - within - a-school, interdisciplinary team teaching structure that delivers instruction to learners of all abilities in heterogeneous classes of no more than 30 students; and (ascd.org)
Research of the effects of heterogeneous grouping on low - achievers indicate positive effects on achievement, self - esteem, and intergroup relations (Slavin, 1990), indicating the addressing of emotional, interpersonal, and intellectual needs. (ncmle.org)
High - functioning teams with heterogeneous populations of students collectively improve achievement through their integrative approach. (mgforum.org)