Recognizing that researchers rely on a variety of definitions of bullying and use different approaches to.measure it, the Centers for Disease Control and Prevention worked with a group of federal agencies and experts in education and psychology to create a uniform research definition, which it released this year. The definition is to be used for research purposes, and still varies from the ways schools define bullying in their rules and policies, the agency emphasized.
Under the uniform research definition,  acts of bullying:
"Are unwanted aggressive behaviors" I This behavior could be online or in person, and it is. committed by “anotheryouth or group of youths who are not siblings or current-dating partners of the victim." While those peers are also capable
of peer harassment, those actions fall into another category of behavior, researchers say.
"Involve an observed or perceived power imbalance" I This power imbalance between the perpetrator and the victim could involve factors like social stature, resources, physical size, or influence.
''Are repeated multiple times or are likely-to be·repeated" I Many schools consider individual actsof peer harassment bullying without considering whether they are part of or likely to be part of a larger pattern of behavior, which is an essential part of the uniform definition,  researchers say.