This document, Important Issues on Risk Assessment of Manufactured Nanomaterials, provides the current
practices, challenges and strategies for assessing risk in circumstances where data are limited, and there is
a necessity for more research on specific risk assessment issues; however, it is not to be construed to imply
scientific and/or policy endorsement of any specific risk assessment methods or models. It should be noted
that this document is a living document. It was current at the time of 9th meeting of the WPMN (December
2011) and subject to amendment and refinement as research affords further understanding of how to assess
and manage nanomaterials.