Long-term measures to reduce the scale and/or the duration eventual adverse effects of unavoidable or unpreventable disaster hazards on a society which is at risk, by reducing the vulnerability of its people, structures, services, and economic activities to the impact of known disaster hazards. Typical risk reduction measures include improved building standards, flood plain zoning and land-use planning, crop diversification, and planting windbreaks. The measures are frequently subdivided into “structural” and “non-structural”, “active” and “passive” measures. N.B. A number of sources have used “disaster mitigation” in this context, while others have used “disaster prevention”. (Simeon Institute 1992)