The Organization for Economic Cooperation and Development (OECD) has issued a report titled "Cooperation on Risk Assessment: Prioritization of Important Issues on Risk Assessment of Manufactured Nanomaterials—Final Report." Citing "major gaps" in knowledge as to "how traditional physico-chemical approaches can be used to assess the behaviour of nanomaterials, i.e., if and what physico-chemical properties are predictors of (eco)toxicity and environmental behavior," OECD identifies research priorities that include physical chemistry, nanomaterial identification, environmental fate and effects, exposure models, and adverse effects.