Comparing Charlton et al (2000) and Williams et al (1981)

Similarities

 * Both were natural experiments. No control over the introduction of TV.
 * Conducted in real life communities which both had never had access to broadcast television.
 * Variables outside the control of both studies: other children or parents' behaviour.
 * Both studies conducted observations to measure the amount of aggression children displayed.
 * Both studies used questionnaires to ask teachers and parents about their children's behaviours.

Differences

 * St Helena was so remote that it had developed a unique culture of parental control. Notel was not unique in this way.
 * On St Helena most people knew each other, and their families managed to keep better watch over children.
 * Notel was on the mainland and had access to popular cultural trends which may have been different in levels of aggression shown.
 * Adults on St Helena may have been reluctant to admit that the children had aggressive behaviour

Summary
Summary of these main points.

Conclusion

 * Children are affected by watching TV
 * Effect of violent tv can be reduced by parental guidance and community support
 * Living in smaller neighbourhoods with a strong sense of community helps
 * However, aggression can be caused by other factors, such as friendship groups, biological factors and triggers in the environment.