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- During the scoping phase a causal diagram should be drawn that describes all variables of the assessment including their causal relationships. It consists of the variables of the assessment. At first all variables are taken into account that seem relevant. While checking for causality it may turn out that more variables are needed and the pictures becomes more complex. Then a simplification process starts and only the relevant links and variables are kept.
- The process can be started on a quite general level (e.g. from the viewpoint of a certain stressor or health outcome) or it can be started on a quite detailed level (e.g. from the viewpoint of PM2.5 concentration and its effects on health in Copenhagen).<section end=glossary />