"The most effective risk-reduction strategies are those that employ a broad-based integrated approach utilizing a combination of prevention interventions. President Harry S. Truman's 1947 conference on fire prevention coined the original Three E's -- education, enforcement and engineering. In 2000, the National Fire Academy added economic incentive and emergency response because of their importance to community risk reduction. The goal of using multiple interventions in parallel is twofold: Prevent incidents from occurring, and when prevention fails, reduce or mitigate the impact of the incident. Each of the E's can contribute to the development of realistic, comprehensive and effective solutions. Together the E's produce a synergistic effect and are more effective than when used individually."
Coffee Break Training - Fire Prevention and Public Education Series No. FM-2013-13
United States Fire Administration: http://www.usfa.fema.gov/