Cooperative classroom structures create more positive student attitudes and interpersonal relations. Their effect on student learning is less clear. TGT (Teams-Games-Tournament) is one cooperative-competitive classroom structure which facilitates learning mathematics and language arts. A study applying TGT to third grade reading classes is reported. TGT students learned more vocabulary and verbal analogy skills than did a comparable control group. The study shows clearly that both cognitive and affective outcomes can be improved by changing the level of classroom cooperation-competition. (Author/MPJ)