Help:Extended causal diagram
Extended causal diagrams are graphical representations of a particular situation, where the objects described are causally related to each other. In addition, the diagrams contain non-causal elements such as value judgements or inferences based on data. Extended causal diagrams utilise the ideas of directed acyclic graphs, but they have additional features.
The pyrkilo method has been developed to facilitate the Science-Policy Interface.
There is a need for methods facilitating the flow of information and understanding between science and policy. The principle is to describe a risk situation in a formal manner. Pyrkilo uses enhanced causal diagrams that contain items along a causal pathway (or network) from e.g. abatement strategies to emissions to dispersion to exposure to effects. They have been designed to describe also non-causal connections such as non-causal reasoning, values, preferences, and arguments.
These diagrams use the Analytica(TM) software platform, a graphical Monte Carlo simulation program. It is based on nodes. They are used to describe and define all the pieces needed for a description of the situation under scrutiny. Of course, similar diagrams may be produced with any graphics software, providing that calculation functions of Analytica are not required.
Many nodes are used as described in Analytica manuals. However, there are also special colours and shapes representing features that are important for pyrkilo diagrams. See Description of each node for more details. You can see the definitions and descriptions by clicking or double-clicking the nodes.
Colour description: xLyT describes the coordinates in the colour palette of Analytica, xth cell from left and yth cell from top. Directions are L left, R right, T top, B bottom, e.g. 1R1B is the right bottom cell. Automatic means that the colour is the default for that node shape.