* presented groups of preschool children with a problem solving task. They were to retrieve food that was positioned just out of reach, and were given two sticks, neither long enough to get the food, and a clamp.
* Group 1 watched an adult join two sticks with a clamp.
* Group 2 made attempts to attach the clamp to a stick
* Group 3 watched an adult solve the problem in its entirety
* Group 4 could play with the objects outside the problem-solving context. They could freely manipulate the sticks and clamps.
* Group 5 was presented with the problem-solving task without any preparation.
* Results: Group 4 (play group) was just as successful as group 3 (watching an adult), and both did much better than the other three groups.