Guidelines for Drawing Causal Loop Diagrams
Casual loop diagrams
Updated Monday, 21st June 2021
These tutorials explain what a casual loop diagram is and show you lot how to become about drawing ane...
What are causal loop diagrams?
How to depict causal loop diagrams
Diagram guidelines
Purpose
Causal loop diagrams are similar to both multiple cause and sign graph diagrams in purpose and construction. They have been developed out of the systems dynamics movement and are almost used in organisational settings. Causal loop diagrams are used to graphically draw dynamic interrelationships amid variables you may not accept considered before. They allow you lot to see how parts of a arrangement that are separated by location or fourth dimension might nonetheless collaborate to generate problems. They tin can exist used as the footing for a estimator simulation model. The most common behaviours modelled this mode are frequently presented equally systems archetypes (eastward.g. fixes that fail, shifting the burden, limits to success, escalation, tragedy of the commons, etc.).
Elements
- A title.
- Phrases.
- Arrows linking the phrases with 's' and 'o' signs on the arrows, indicating the direction of alter.
- 'B' or 'R' denotingbalancing orreinforcing feedback loops, respectively.
Conventions
- The words or phrases correspond variables.
- The arrows represent links betwixt the variables, with the assumption that when variableA changes, variableB changes.
- A relationship where a alter inAleads to a change inB in thesame direction is denoted past an 's' while where a change inA leads to a modify inB in theopposite direction is denoted by an 'o'.
- A closed circle of variables and links makes a feedback loop. Where the signs are all 's' or all 'o' then this is chosen a reinforcing (or positive) feedback loop, and where at that place are both an 's' and an 'o' then it is a balancing (or negative) feedback loop.
- A delay in a human relationship is sometimes marked by a double line intermission in the linking arrow.
- Thought bubbles can exist added to reveal the mental model behind links and place the places where human choices are made.
Guidelines
- Formulate the core problem and tell the story of the problem behaviour. Choose the key variables you lot want to work with and name them precisely. Use nouns or substantive phrases rather than verbs (e.grand. 'orders shipped' rather than 'ship'). Be sure your variable fits into phrases, such as 'level of', 'amount of' or 'size of'. Use a neutral or positive term whenever possible to avoid defoliation that tin arise with negative forms of nouns. Include intangible variables (due east.g. morale) where appropriate as well as tangible variables (e.yard. workers, buildings).
- Graph the variables' behaviour over fourth dimension and hypothesise well-nigh how the variables might exist interrelated. Exist careful to be as accurate equally possible past acknowledging any distinctions between a proportional modify in the aforementioned management and a direct change in the same management (or vice versa).
- Use links and arrows to bear witness the direction of the variables 'crusade and consequence' relationships. Marking the links with an 's' and an 'o' to evidence the nature of (same oropposite) the link. Characterization the heart of every loop with either an 'R' (forreinforcing) or a 'B' (forbalancing).
- If a variable has multiple consequences, endeavor lumping them into 1 term while finishing the remainder of the loop. You tin can 'unpack' these subsequently when you are fix to explore the significance of specific interventions.
- Most every action has differing long term and curt term consequences. To show increasingly longer term consequences or side effects add new loops or links to your diagram.
- If a link between two variables is not clear to other people and requires a lot of explaining, endeavour redefining the variables or inserting an intermediate variable to clarify the connection.
- Cheque the reasoning behind your causal loop diagram by going around the loop and telling the story depicted by the links and the southward and o labels.
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Source: https://www.open.edu/openlearn/science-maths-technology/engineering-technology/casual-loop-diagrams
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