IRCT20171218037935N1 IRCT 2018-02-01 Hamedan University of Medical Sciences Design, implementation and evaluation of an interventional program for preventing Musculoskeletal Pain (MSP) mong primary school students Effect of educational intervention on the prevention of Musculoskeletal Pain (MSP) in elementary school students 2018-02-04 anticipated 222 Complete https://irct.ir/trial/28320 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Randomization description: Multi-stage cluster sampling will be used. The sample classes are selected based on the socioeconomic levels (high, middle and low), gender (girls and boys), and the students' educational base. Then the list of schools and the number of elementary students in the city of Hamedan was taken from the Department of Education. According to the required sample size and according to the number of schools in each district, randomly, according to the random number table, six schools in district one (three girls' schools and three male schools) and seven schools in district two (four schools Girls and 3 male boys) will be selected. Then from each school, all the grades (from the first to sixth) and from each grade of a class will be randomly selected, and from each class the required sample will be selected randomly according to the number of students in each grade on the list of students. N/A Musculoskeletal pain. Intervention 1: Intervention group: 3 Educational sessions;educational booklet;educational film;pamphlet and stretching. 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 Decisions should be made at the university's discretion