IRCT20151112025014N3 IRCT 2018-01-21 Hamedan University of Medical Sciences effectiveness of an intervention on aggressive behaviors in elementary students effectiveness of an intervention on aggressive behaviors in elementary students 2018-01-10 anticipated 280 Complete https://irct.ir/trial/28277 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Other design features: In this study, an ecological model (individual, interpersonal, organizational, and policy levels) will be used to explore the various components of the whole school approach in prevention of aggression, Randomization description: In this study, stratified random sampling method will be used and the sample classes studied will be based on the gender of students (boy / girl), school status in terms of implementation of the program of health promoting schools(health promotion / non-promotion schools) and the region Urban (semi-possessed / disadvantaged) will be selected. Then the list of schools and the number of elementary students in the second course of the city of Kermanshah will be collected from the Department of Education. The required sample, in terms of student size and the number of schools in each class, will be selected by table of random numbers and by considering the different economic status, Blinding description: Participants are unaware of the allocation of study groups. N/A aggression. Intervention 1: Intervention group: 5 Educational sessions; 10 sessions of psychological counseling; educational booklet; poster and educational banner;Role playing. Intervention 2: Control group: This group does not receive any intervention. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is This should be done with the University's discretion.