Teachers in the experimental schools used past mathematics performance record to constitute
heterogeneous teams of five to six members which were given time to decide on team name
for identity. The steps of STAD CL strategy (Slavin, 1997) were followed as was stipulated
in the teachers’ guide. The cycle of instructional activities included: Lesson presentation;
Team study, where students worked on worksheets in their teams to master the material;
Evaluation, where students took individual quizzes. Finally, team recognition where team
scores were computed on the basis of team members’ improvement scores. The results were
displayed on school bulletin board every week and at the end of the topic certificates were
awarded to the high scoring teams.