In this paper, we report the findings of a critical discourse analysis of the diagnostic criteria for Attention Deficit Hyperactivity Disorder (ADHD) and Hyperkinetic Disorder (HD) in two clinical manuals-the Diagnostic and Statistical Manual of Mental Disorders, 5 th edition and International Classification of Diseases, 10 th edition. We examine the actions (behaviors) that are said to indicate the presence of ADHD/HD and analyze what the inclusion of these actions reveals about the relationship between ADHD/HD, cultural knowledge and values. Our analysis reveals that both manuals use subjective, value-laden language to construct a mentally ill individual in opposition to an unseen, supposedly 'normal' person. We argue that the current criteria draw into question whether ADHD/HD meets the manuals' own definitions of a disorder and further, that the discourse of the manuals are intertwined with the everyday practices of schools and serve to legitimize status quo educational practices.