 Students with EBD are often categorized as "internalizers" (e.g., have poor self-esteem, or are diagnosed with an anxiety disorder or mood disorder) or "externalizers" (e.g., disrupt classroom instruction, or are diagnosed with disruptive behavior disorders such as oppositional defiant disorder and conduct disorder).Male students may be over-represented in the EBD population because they appear to be more likely to exhibit disruptive externalizing behavior that interferes with classroom instruction.Females may be more likely to exhibit internalizing behavior that does not interfere with classroom instruction, though to what extent this perception is due to social expectations of differences in male and female behavior is unclear.