 According to social construction theory it is societies that determine the boundary between normal and abnormal behavior . Members of society , including physicians , parents , and teachers , determine which diagnostic criteria are used and , thus , the number of people affected . This leads to the current situation where the DSM @-@ IV arrives at levels of ADHD three to four times higher than those obtained with the ICD @-@ 10 . Thomas Szasz , a supporter of this theory , has argued that ADHD was " invented and not discovered . " 
