These finding might also be relevant cor the measurement of chberbullying. Valid measurement instrument of cyberbullying have to capture the full breath and width of the construct according to the corresponding definition. For example, if a single question is asked respondents have to have a correct understanding of the technical term " cyberbullying " to answer adequately. Depending on the underlying definition, this understanding should be sensitive to defining characteristics such as power imbalance and should include cyberbullying with, for example, different media and of different types. However, not all adolescents might be aware that outing or exclusion in cyberspace constitutes cyberbullying. it is a problem, when respondents have a biased understanding of " cyberbullying" or if questionnaires only cover a fraction of the construct. Detected prevalance rates might underestimate (or overestimate) the real occurrence of cyberbullying.