1.

For at least a year, individual repeatedly displays severe outbursts of temper that are extremely out of proportion to triggering situations and different from ones displayed by most other people of his or her age.

2.

The outbursts occur at least three times per week and are present in at least two settings (home, school, with peers).

3.

Individual repeatedly displays irritable or angry mood between the outbursts.

4.

Individual receives initial diagnosis between 6 and 18 years of age.

(Information from: APA, 2013)