“…However, other studies by the same researchers (M. Lockheed & Harris, 1982) had reported previously that students in mixed-sex science groups expressed more positive attitudes toward cross-sex collaboration, showed a reduced level of sex stereotyping, and were less sexbiased in their perceptions of student competence than students with less cross-sex collaborative experiences. Other studies indicate a decrease in female achievement, academic and physical, when females are placed in mixed-sex groups (Weisfeld et al, 1983), or indicate that pupils actually develop negative attitudes about mixed-sex groups (M. Lockheed, 1984;Serbin, Tonick, & Sternglanz, 1977) or the need to devise special strategies to overcome these barriers (Fennema & Peterson, 1985;Fennema, Reyes, Perl, Konsin, & Drakenberg, 1980;Fennema, Wolleat, Pedro, & Becker, 1981).…”