SAA’s new Dictionary of Archives Terminology has superseded this Glossary as of 4/29/2020.

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Nearly every storage environment is dynamic, changing with the weather, with the seasons, or by conscious actions taken to save money or to be more comfortable. It is difficult enough to know the effect of any given static condition on the decay rate of a

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Nearly every storage environment is dynamic, changing with the weather, with the seasons, or by conscious actions taken to save money or to be more comfortable. It is difficult enough to know the effect of any given static condition on the decay rate of a collection; the total effect of changing conditions over time was impossible to obtain at all, until the conception of the Time-Weighted Preservation Index (TWPI).

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