3.1 The two experimental schools E1 and E2 were exposed to STAD, CL.
3.2 Participating teachers in experimental schools were trained for one week.
3.3 The teaching guide contained the general STAD, CL procedures, elements of cooperative learning, team scores computation procedures, group and individual rewards, breakdown of subtopics in scale drawing, teachers` and learners` activities, resources and references.
3.4 Teachers in the experimental schools used past mathematics performance record to constitute heterogeneous teams of five to six members.
3.5 The steps of STAD CL strategy 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.