Risk Assessment in the 21st Century (RISK21) Committee

Mission Statement

The committee’s mission is to promote a transparent, purpose-driven, structured approach to risk assessment based on key principles, including problem formulation, tiered integration of both hazard and exposure at each step, and fit for purpose.

Version 2.0 of the RISK21 webtool is now available. To access the RISK21 webtool, please visit risk21.org.

HESI Staff

Committee Events

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Committee Publications

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Using Exposure Bands for Rapid Decision Making in the RISK21 Tiered Exposure Assessment

The Health and Environmental Sciences Institute (HESI) Risk Assessment in the 21st Century (RISK21) Committee was initiated to address and catalyze improvements in human health risk assessment. RISK21 is a problem formulation-based conceptual roadmap and risk matrix visualization tool, facilitating transparent ...

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A Framework for Cumulative Risk Assessment in the 21st Century

The Health and Environmental Sciences Institute (HESI) has developed a framework to support a transition in the way in which information for chemical risk assessment is obtained and used. The approach is based on detailed problem formulation, where exposure drives the data acquisition process in order to enable informed ...

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Problem Formulation for Risk Assessment of Combined Exposures to Chemicals and Other Stressors in Humans

When the human health risk assessment/risk management paradigm was developed, it did not explicitly include a “problem formulation” phase. The concept of problem formulation was first introduced in the context of ecological risk assessment (ERA) for the pragmatic reason to constrain and focus ERAs on the key questions. ...

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Risk Assessment in the 21st Century: Roadmap and Matrix

The RISK21 integrated evaluation strategy is a problem formulation-based exposure-driven risk assessment roadmap that takes advantage of existing information to graphically represent the intersection of exposure and toxicity data on a highly visual matrix.

Read more

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