The two experimental groups were
taught using co-operative learning strategy as treatment and two control groups were
taught by use of conventional teaching methods. The sample size was 323 students
comprising 161 boys and 162 girls. A mathematics achievement test (MAT) in scale
drawing had a reliability coefficient of 0.84 .The MAT was administered to two
groups (E1and C1) before the teaching of the topic and then to all the four groups
after learning the topic, scale drawing.