The DSM-IV and ICD-10 diagnostic criteria have been criticized for being too broad and inadequate for assessing adults,[20] overly narrow (particularly in relation to Hans Asperger's original description of individuals with AS),[3][21] and vague;[16] results of a large study in 2007 comparing the four sets of criteria point to a "huge need to reconsider the diagnostic criteria of AS".[4] The study found complete overlap across all sets of diagnostic criteria in the impairment of social interaction with the exception of four cases not diagnosed by the Szatmari et al. criteria because of its emphasis on social solitariness. Lack of overlap was strongest in the language delay and odd speech requirements of the Gillberg and the Szatmari requirements relative to DSM-IV and ICD-10, and in the differing requirements regarding general delays.[4] A small 2008 study of children referred with a tentative diagnosis of AS found poor agreement among the four sets of criteria, with one overlap being only 39%.[22] In 2007 Szatmari et al. suggested a new classification system of ASD based on familial traits found by genetic epidemiology.[23]