- He put a cat in a cage with a latch across the door and a piece of salmon outside the cage. Thorugh trial and error the cat unlocked the door and ate the fish. With repetition each effort become quicker. Behaviour that produced the desired effect became dominant and therefore occurred faster in the next experiments
- This is trial and error learning
- Law of effect: if the effect of the behaviour was good, then the behaviour is learnt and repeated
