ANSI Z535 is an American standard that sets forth a system for presenting safety and accident prevention information. It corresponds to (but is not fully compatible with) the international ISO 3864 standard. The ANSI Z535 standard comprises the following six individual standards: The ANSI Z535 standard series is continually improved and refined based on human factors research and court case precedents. Every five years these standards are formally revised with the most recent publication on September 15, 2011.