72 children split into 3 groups (aggressive role model, non-aggressive role model, control)
48 children in experimental groups of 6 (3 boys, 3 girls) - half saw same sex role model, half saw opposite
Aggressive role model was violent towards to Bobo doll (hit it with a mallet, made noises eg POW)
Children then sent into another room with toys that they weren't allowed to play with, making them frustrated
Then sent into room with other toys and Bobo doll
Children who saw aggression were more aggressive