The guiding principle of composite risk management (CRM) is to integrate CRM into all phases of missions and operations. All phases of the missions and operations include planning, preparation, execution, and recovery. Risk must be assessed at all levels of the mission and operations.
Sumerians were known for two inventions:
irrigation, that is bringing water to crops that would otherwise not have access to it
and writing: cuneiform, one of two first writing systems on earth (the other being hieroglyphs).
