Two psychology students investigated the effect of type of play area on friendly behaviours. They watched the behaviour of six-year-old children in two different play areas and recorded their observations using a set of behavioural categories. They observed 25 children in the first play area and another 25 children in a second play area.
Play Area 1 was a grass space, surrounded by trees and plants. Play Area 2 was a paved space, surrounded by brick and concrete walls.
What are behavioural categories? Explain why it was important to use behavioural categories in this observation.