Aggression among school children is a commonly studied and discussed top in the media.

Aggression is not nice, but according to a new study, aggression is normal human behavior that is part of normal development, at least in boys (Isen et al., 2015).

One way to measure aggressive behavior at school is the aggression scale developed by Pamela Orpinas and Ralph Frankowski (2001).

This short 11-item scale was developed in Texas for children in US middle school.

The scale ranges from 0 to 66. Boys scored 19.3 and girls 13.2.

See also the PsyToolkit implementation of the Buss-Perry Aggression Questionnaire

Run the demo

The scale and items were presented in a journal and seemingly can be used by anyone for research purposes.


This is a very straigtforward scale. Note that custom scores (starting with 0) are used in the scale. These scores are given in curley brackets (e.g., {score=2}).

The survey code for PsyToolkit

Copy and paste this code to your PsyToolkit account if you want to use the scale in your own online research project
scale: times
- {score=0} never
- {score=1} 1 time
- {score=2} 2 times
- {score=3} 3 times
- {score=4} 4 times
- {score=5} 5 times
- {score=6} 6 times or more

l: aggression
t: scale times
q: Please answer the following questions thinking of<br>
what you actually did <b>during the last 7 days.</b><br><br>
For each question, answer how many times you did that behavior <b>during
 the last 7 days.</b><br>
- I teased students to make them angry.
- I got angry very easily with someone.
- I fought back when someone hit me first.
- I said things about other kids to make other students laugh.
- I encouraged other students to fight.
- I pushed or shoved other students.
- I was angry most of the day.
- I got into a physical fight because I was angry.
- I slapped or kicked someone.
- I called other students bad names.
- I threatened to hurt or to hit someone.

l: aggressionscore
t: set
- sum $aggression

l: feedback
t: info
q: Your aggression score is {$aggressionscore} on a range from 0 to 66.<br>
In the original study developing the scale, the following averages were found:<br>
<li>Boys: 19.3
<li>Girls: 13.2


  • Orpinas, P., and Frankowski, R. (2001). The Aggression Scale: A Self-Report Measure of Aggressive Behavior for Young Adolescents. Journal of Early Adolescence, 21, 50-67.

  • Isen, J.D., McGue, M.K., and Iacono, W.G. (2015). Aggressive-antisocial boys develop into physically strong young men. Psychological Science, in press, but online.