Evaluate Hughes' 'policeman doll study'.

Evaluating Hughes' study involves considering its methodological strengths and weaknesses. Its primary strength lies in its improved design compared to Piaget's original work. By creating a task that was more engaging and understandable for young children, Hughes provided a more valid test of egocentrism. The careful, standardised procedure also adds to its scientific credibility. However, like many laboratory studies, it can be criticised for lacking ecological validity – the artificial setup with dolls may not fully represent real-world social perspective-taking. There is also the potential for experimenter bias, where the researcher's hopes for a particular outcome might subtly influence how they interact with the child participants. Despite these limitations, the study was highly influential in demonstrating that Piaget may have underestimated children's cognitive abilities.