Answer
The precautionary matrix delivers the following key messages:
- The precautionary principle must and can be applied to synthetic nanomaterials
- Differentiation is necessary when considering the safety and risks (for employees, consumers and the environment)
- Not all nanomaterials are the same: Case-by-case differentiation of scenarios depending on the conditions of use or the surrounding conditions
- Voluntary measures by the responsible parties ("causers") are needed, but should be supported by non-bureaucratic assistance
- The precautionary matrix produces a rough preliminary decision and uniform basis for discussions of the need for more extensive investigations