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Scenario uncertainty refers to uncertainty in specifying the risk scenario that is consistent with the scope and purpose of the assessment.  

The message should be consistent with the purpose of the communication, which could be raising awareness, educating/informing, achieving consensus, changing behavior, changing perception, or receiving input.  

The risk profile step helps reduce uncertainty by identifying data gaps and defining the risk management objectives.  

Calling something safe is not a risk management decision.  

The goal of public involvement is to reach only a select few interested parties and exclude others from the decision-making process.  

The external communication responsibilities of the risk analysis team involve their interactions with external stakeholders and the public.  

A good public involvement program involves excluding the public from defining the problems and risk management objectives.  

Parameter/input uncertainty refers to uncertainty due to gaps in scientific knowledge which hamper an adequate capture of the correct causal relations between risk factors.  

The micro-level of uncertainty pertains to specific decision contexts and their relevant knowledge, data, and models.  

The population of a city has a true value.