studied narcissism in children measured by teachers who had known them for at least 3 months.
No measurements were taken from adults who may know them better,parents
Kokkinos
used self-reports techniques,narcissists are concerned with how they present themselves,so could be a systematic bias in how they compare,often exaggerating or minimising their degree or narcissism
Doubts about validity,we cant be confident about drawing conclusions linking narcissism to bullying behaviours
