DSM-IV criteria for these drug classes were also assessed using the SSAGA, which obtains full DSM-IV diagnostic criteria for abuse and dependence. SSAGA-based assessments of dependence on these substances have acceptable to good reliability and validity. Again, the reduced reliability and validity of SSAGA assessments of abuse on these substances is consistent with the estimated reliability and validity of other assessments of abuse on these substances and likely reflects limitations of the DSM operationalizations of abuse. Drug classes assessed included: (a) sedatives; (b) cocaine; (c) amphetamines and other stimulants; (d) opioids; (e) hallucinogens; (f) disassociates (phencyclidine, ketamine); (g) solvents; and (h) inhalants.