Assessing the diagnostic contribution of internet gaming disorder criteria requires improved content, construct and face validity-a response to Rehbein and colleagues (2015).

A letter to the editor is presented in response to the article "Prevalence of internet gaming disorder in German adolescents: Diagnostic contribution of the nine DSM-5 criteria in a state-wide representative sample" by E. Rehbein, S. Kliem, D. Baier, and others and published in a 2015 issue.