n.a system of processes and technologies employed to protect archival materials from the adverse effects of temperature, humidity, air quality, light, and biological infestationFox 1985, 35Archivists can begin “doing preservation” as information and resources are available. While it will probably be impossible to adhere immediately or fully to preservation guidelines for environmental control and internal procedures, even apparently minor steps (such as reductions of temperature and light levels or improvement of housekeeping and shelving practices) will help extend the life of materials.Hackbart-Dean and Montgomery 1998, 83–84Another benefit of a field survey is to determine a collection's preservation and security requirements. It also helps establish project priorities and costs for physical transfer, conservation treatment of existing problems, arrangement and description, and long-term maintenance (such as, through environmental control).Clarke 2009, 190Preservation begins at the repository level not only in terms of policy but also in terms of physical storage, as the ability to provide proper environmental control is the most fundamental consideration of collection preservation.one such process or technologyYakel 1989, 207Second, the annual report noted that the environmental control unit had been malfunctioning and that it was difficult to maintain stable temperature and humidity in the vault, where the most precious records are kept.Nutt and Worrell 2015, 332The chief priority identified during the planning process was the need for a facility designed specifically for archival storage with effective environmental controls. Second, an ongoing system of environmental monitoring was developed. This program includes systematically measuring temperature and humidity levels and checking potential trouble areas for moisture and other problems.