Tiered assessment schemes are an efficient way of performing risk assessments.  If appropriately constructed, tiered assessment schemes allow assessments for low risk situations to be rapidly completed with consevative assumptions and little effort, reserving (and permitting) more realistic assessments when needed.  In general, moving from a lower tier to a higher tier results in increased effort to perform the assessment, but with increased realism for the results since the assumptions made are reduced.  Evaluation of reasonable worst case scenarios are often an important middle tier of many assessment schemes and, if scenarios are appropriately defined, can be an efficient step in a tiered assessment scheme.  As an example, a tiered assessment procedure has been proposed for assessing the impact of pesticides in drinking water on human health.

Progressive tiered schemes for refining exposure estimates and its application to assessing pesticides in drinking water

248th National Meeting (2014)

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