The city of Bergen has a goal of becoming fossil-free in 2030. How do we get there? Some weeks ago, local experts from different domains came together and developed a causal loop diagram (CLD). This will form the skeleton for the modelling hackathon.
This Loan Cost Model is the second in the series. It takes into account the potential cost of student loans in the case that the student does not manage to graduate college or does not succeed in their career.
Based on 1990 SDR Article. Control systems act to make their own input match internal standards or reference signals. Competent control systems create illusions of stimulus response causality. Stimulus-response theory can approximate the relationship between disturbance and action, but it can't predict the consequences of behavior. These consequences are maintained despite disturbances.
The limits to results structure endeavors to bring a balance between a current state and a desired state though more often than not the action is limited by some constraint. See also Archetypes.
The problem with microworlds is that too often people simply learn to play the game and the deeper lessons associated with the underlying structure and its associated patterns of behavior are completely missed. It is more appropriate for people to build and work with models to develop a deeper understanding of the relationships and then relate them to family, community, school and the world.
Causal loop diagrams are more rigorous than rich pictures though are still only contain a very few elements with well defined rules for connecting them.
Use a bathtub model to investigate the manner in which inflows and outflows govern the quantity of a stock. Extend the structure to create and investigate the relationships of a goal seeking balancing loop.
The limits to results structure endeavors to bring a balance between a current state and a desired state though more often than not the action is limited by some constraint. See also Archetypes.
An introduction to what seems to be our typical approach to dealing with problems that arise unexpectedly when we're focused on dealing with other immediate issues.
Bathtub model with filling control added. Running the model is essentially considered to be turning on the faucet and water will run into the bathtub until it is full.
This common archetype of systems that include relapse or recidivism allows exploration of the unintended effects of increasing upstream capacity and swamping downstream capacity. The increase in the relapse rate eventually returns to swamp upstream capacity as well. A social welfare example, based on a TANF case study, from How Small System Dynamics Models Can Help the Policy Process. N. Ghaffarzadegan, J. Lyneis, GP Richardson. System Dynamics Review 27,1 (2011) 22-44 Conference version at http://bit.ly/HlxtZj
