Despite there being a multitude of standards, only several standards are used extensively. Two examples of widely-accepted standards include the U.S. National Institute of Justice stab and ballistic documents.
Since NIJ started its testing, more than 3,000 officers’ lives have been saved. Along with the NIJ, the standards set forth by the United Kingdom’s Home Office Scientific Development Branch are widely used in several countries and governments. Countries will use these standards and incorporate the basics and modify them to fit the bullets of the area for the test.
Here is a brief image for ballistic threat levels: