Featured Author

John Hayward

I am a Visiting Research Fellow in Mathematics at the University of South Wales. Before my retirement, I was a senior lecturer at the university, teaching specialist courses in system dynamics, mathematical modelling and agent-based methods. I was awarded a BSc in astrophysics, and a PhD in applied mathematics, from the University of London, and then spent my career as a lecturer in mathematics. My research is in mathematical sociology with applications to the spread of social phenomena, such as ... Read more

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We found 40 items
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#1

PEOPLE-EXPRESS

by Khalid+Saeed
A SIMPLIFIED VERSION OF PEOPLE EXPRESS GAME FOR CLASSROOM OR GROUP USE
sim ⋮ 16,507 runs
Business Economics Education
10109.486
#2

Greenhouse Gas Emissions Management Tool

by SMI-JKMRC
sim ⋮ 2,575 runs
Environment Business Technology Science Economics
6402.75
#3

Systems In Focus: Conservation

by isee systems
Fishing areas are within the commons, which encourages greater investment in ships when there is dem ... Read more
Fishing areas are within the commons, which encourages greater investment in ships when there is demand. More importantly, we can never really know the population of the given fishery and therefore whether it is in danger of being fished out. This model explores the trade-offs between investing in more ships to catch more fish and the long-term viability of the fishery.
model ⋮ 4,265 downloads
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Environment Business Technology Ecology Systems in Focus
5932.83
#4

Electric Vehicles in Norway (Model)

by UiB MINDS
© Daria Yermolova & Valentina Orliuk 2020 A model that examines the various factors affecting the el ... Read more
© Daria Yermolova & Valentina Orliuk 2020 A model that examines the various factors affecting the electric car market in Norway, originally built for the course GEO-SD304 at UiB.
model ⋮ 2,850 downloads
Download Model
Environment Business Technology transport electric
5267.2
#5

Limits to Growth Archetype

by John Hayward
Shifting loop dominance in a limits-to-growth archetype is examined using the Hayward/Boswell Loop I ... Read more
Shifting loop dominance in a limits-to-growth archetype is examined using the Hayward/Boswell Loop Impact Method.
sim ⋮ 2,309 runs, 232 downloads
Download Model
Business Loop Dominance Limits to Growth Shifting loop dominance Urban Dyanmics
4681.928
#6

Supply Chain Management without Forecasting

by isee systems
Accurate demand forecasting is an essential part of most supply chain management algorithms. Yet, s ... Read more
Accurate demand forecasting is an essential part of most supply chain management algorithms. Yet, supply even in the most diligently managed chains can deviate widely from demand. Additionally, any disturbance in demand will often be amplified in a supply chain creating what is known as bullwhip effect. This simulation uses three parsimonious models to demonstrate that supply can be regulated reliably without forecasting demand. The inspiration for these models comes from PID (Proportional, Integral, Derivative) control in engineering controllers that utilize multiple functions of error (discrepancy between goal and actual condition) to regulate a quantity.
sim ⋮ 2,720 runs, 421 downloads
Download Model
Business operations management
3723.4592
#7

Enabling Resilient Food Systems: Simulating the Impact on Local Farmers' Livelihoods in Greater Adelaide, Australia

by UiB MINDS
© Jefferson Rajah & Martin Grimeland 2022 Considering the complex and dynamic nature of food systems ... Read more
© Jefferson Rajah & Martin Grimeland 2022 Considering the complex and dynamic nature of food systems, the System Dynamics method was opted for investigating the questions posed. Representing the real-world system responsible for farmers´ livelihoods, a simulation SD model was constructed as a proof-of-concept for the councils' policy strategy. It is evident, based on the findings of the model, that increasing food system literacy does indeed increase the resilience of SME farmers' livelihoods.
model ⋮ 1,410 downloads
Download Model
Environment Business Education food system agriculture
3599.78
#8

COVID-19 Economy

by isee systems
This models the economic impacts of an extended shutdown due to the coronavirus pandemic and explore ... Read more
This models the economic impacts of an extended shutdown due to the coronavirus pandemic and explore the policies adopted by the United States to mitigate these effects.
model ⋮ 3,461 downloads
Download Model
Business Science Economics COVID-19 coronavirus
3589.819
#9

Dynamics of Non-Profit Workers’ Passion Burnout and Intention to Leave

by UiB MINDS
© Jefferson Rajah 2021 Passionate workers join the non-profit sector only to experience a collapse i ... Read more
© Jefferson Rajah 2021 Passionate workers join the non-profit sector only to experience a collapse in their passion level as a result of organisational conditions, and thus shore up their intention to leave over time. The results from this model suggest that work overload and physical exhaustion affecting productivity, fall in professional efficacy, and negative affection from perceived organisational injustice drive the collapse in passion. Of these, role overload and high expectations of passionate employees was found to have the highest impact. Originally developed for the course GEO-SD304 and presented at the International System Dynamics Conference.
model ⋮ 1,546 downloads
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Business human behavior organizational psychosocial burnout
3475.212
#10

Stella Architect B.M. Sample

by Armando Izquierdo
Este modelo es un primer intento de utilizar el "Business Canvas" desarrollado por Alexander Osterwa ... Read more
Este modelo es un primer intento de utilizar el "Business Canvas" desarrollado por Alexander Osterwalder e Yves Pigneur, para explicar su carácter sistémico mediante la simulación de un modelo de negocio genérico utilizando Stella Architect. El objetivo principal es mostrar el vínculo entre los conceptos del pensamiento sistémico y la práctica del "Systems Dynamics" con el ampliamente difundido "Business Canvas". En la narrativa utilizada para describir la construcción del diagrama "Stock & Flow", se denomina entre parentesis el tipo de componente (Stock, Flow, Converter, o Conector) correspondiente a los principales elementos del modelo de negocio. La simulación permite visualizar la naturaleza sistémica de un modelo de negocio representado mediante el "Business Canvas".
sim ⋮ 752 runs, 170 downloads
Download Model
Stella Architect Business Canvas Modelos de Negocios Alex Osterwalder Simulación
3358.672
#11

Systems In Focus: Manufacturing

by isee systems
In this simple example, we have modeled the basics of a bottling plant. Before we can model the proc ... Read more
In this simple example, we have modeled the basics of a bottling plant. Before we can model the process however, we need to consider the supplies required to create the final product, in this case, water. A bottling plant requires a constant supply of purified water. It is usually run through three sets of filters that remove smaller and smaller particles before being sterilized.
model ⋮ 2,915 downloads
Download Model
Business Systems in Focus Manufacturing
3163.6968
#12

COVID-19 Economy Model

by isee systems
Our latest Story of the Month explores the economic cost of the COVID-19 stay-at-home orders in the ... Read more
Our latest Story of the Month explores the economic cost of the COVID-19 stay-at-home orders in the United States. Are there policies that can help mitigate these costs? Do the provisions of the CARES Act have a significant effect on the economic outcomes? Find out in our new simulation.
sim ⋮ 2,541 runs
Business Economics Education COVID-19 coronavirus
3010.2544
#13

COVID-19: Role of hospitals, soc. dist., and vaccines

by Michael L Deaton
sim ⋮ 4,027 runs
Environment Biology Business Technology Science
2508.72
#14

Cyber sécurité Cie aerienne Lowcost

by didier CUMENAL
Modèle et simulation d'une attaque cyber sur le langage gouvernance et le management d'une Cie aérie ... Read more
Modèle et simulation d'une attaque cyber sur le langage gouvernance et le management d'une Cie aérienne
sim ⋮ 3,344 runs
Business Education Cybersecurity
2264.362
#15

Power Devolution in Community-Based Natural Resource Management

by UiB MINDS
© Christina Gkini, Ashish Shrestha & Birgit Kopainsky 2020 A model examining the devolution of power ... Read more
© Christina Gkini, Ashish Shrestha & Birgit Kopainsky 2020 A model examining the devolution of power in community-based Natural Resource Management programmes, originally developed for the course GEO-SD325 at UiB and presented at the International System Dynamics Conference 2020.
model ⋮ 1,321 downloads
Download Model
Business Ecology resource management public policy UiB
2244.4734
#16

Systems In Focus: Business

by isee systems
Deciding when to expand a business is difficult in any industry. For the airline industry, there are ... Read more
Deciding when to expand a business is difficult in any industry. For the airline industry, there are both large investments and long delays involved in expansion, making it important to test your assumptions as you go.
model ⋮ 3,310 downloads
Download Model
Business Systems in Focus
2204.9133
#17

Electric Vehicles in Norway (ILE)

by UiB MINDS
© Daria Yermolova & Valentina Orliuk 2020 An interface and story that examines the various factors a ... Read more
© Daria Yermolova & Valentina Orliuk 2020 An interface and story that examines the various factors affecting the electric car market in Norway, originally built for the course GEO-SD304 at UiB.
sim ⋮ 1,440 runs, 58 downloads
Download Model
Environment Business Technology UiB MINDS
1846.5
#18

Volunteer Retention at Bergen's Kvarteret (Model)

by UiB MINDS
© Richard Ruston 2020 examines the internal systemic reasons behind difficulties in volunteer retent ... Read more
© Richard Ruston 2020 examines the internal systemic reasons behind difficulties in volunteer retention at Bergen's central student cultural hub: Det Akademiske Kvarter.
model ⋮ 1,165 downloads
Download Model
Business retention volunteering human resource UiB
1634.985
#19

Integrated Model for Human-Wildlife Coexistence in the Hwange Kazuma Chobe Landscape

by UNEP-Wildlife
This model describes the dynamics and interactions between agriculture, forestry, local communities, ... Read more
This model describes the dynamics and interactions between agriculture, forestry, local communities, tourism, water and wildlife in the Hwange Kazuma Chobe Wildlife Dispersal Area, which part of the Kavango Zambezi Transfrontier Conservation Area (KAZA) in Southern Africa. The structure of the model is based on the knowledge of local stakeholders in all the above sectors. It was developed by experts from the Universities of Bergen, Boğaziçi, Cairo, Nova Lisbon and Stellenbosch. The model is part of the Africa’s Coexistence Landscapes project, implemented by the UN Environment Programme in collaboration with the KAZA Secretariat and the Governments of Botswana and Zimbabwe, with the financial support of the European Union. The model and interface are the sole responsibility of the authors and do not necessarily reflect the views of the European Union, the UN Environment Programme, the Governments of Botswana and Zimbabwe or the KAZA Secretariat.
sim ⋮ 513 runs
Environment Biology Business Science Economics
1519.894
#20

tragedy of commons water crisis

by Eleanor+Hagan
Water scarcity is the lack of fresh water resources to meet water demand.
model ⋮ 919 downloads
Download Model
Environment Biology Business Technology Science
1386.527
#21

El Juego de la Manada

by Martin Schaffernicht
Prototipo para testear políticas de decisión en el contexto del problema de decisión de un responsab ... Read more
Prototipo para testear políticas de decisión en el contexto del problema de decisión de un responsable de manda que debe decidir el tamaño de la manada de manera a obtener el mayor rendimiento sostenible. (Versión del 6 septiembre 2022)
sim ⋮ 1,670 runs
Environment Business Education
1297.7
#22

ccf poverty popuplation and climate change

by ROHIT+SOLANKI
a cld covering various sectors and majorly interacting between social and ecological systems.
diagram ⋮ 815 downloads
Download Model
Environment Biology Business Technology Science
1219.535
#23

Räuber Beziehung

by gringe
harry is gringe und er liebt hermine doch! Harry Styles wurde am 1 februar 26!!!!! Ich liebe Pomme ... Read more
harry is gringe und er liebt hermine doch! Harry Styles wurde am 1 februar 26!!!!! Ich liebe Pommes mit Mayo und Gurken Nano wurde von aliens geschickt
model ⋮ 660 downloads
Download Model
Environment Biology Business Technology Science
1216.07
#24

Positive Feedback

by Franco Posa
Basic positive feedback model
model ⋮ 779 downloads
Download Model
Environment Biology Business Technology Science
1142.431
#25

Caso Smart Navigator

by F Arenas
Simulador para toma de decisiones estratégicas en un mercado creciente
sim ⋮ 4,633 runs
Business
1127.42
#26

trag of commons

by Eleanor+Hagan
diagram ⋮ 802 downloads
Download Model
Environment Biology Business Technology Science
1122.62
#27

Project Management Simulator

by Edward Anderson
This is a project management simulator for my project management class. It shows the impact of team ... Read more
This is a project management simulator for my project management class. It shows the impact of team size, overtime for the project team, meetings, and project launch timing.
sim ⋮ 2,062 runs
Business Project Management
1100.724
#28

Tu Patineta (A) - English Version

by Fabio Ponce
This simulator is based on a case called Tu Patineta (A), written by Dr. Roy Zuñiga, full teacher at ... Read more
This simulator is based on a case called Tu Patineta (A), written by Dr. Roy Zuñiga, full teacher at Incae Business School. It is not intended to offer an accurate solution to the case, but to simulate the possible behaviors of the process considering changes in the input variables described in it.
sim ⋮ 1,331 runs
Business Education Operations
1077.4507
#29

Microchips and the Auto Industry

by isee systems
After 2 years unreliable supply chain of microchips, the auto industry is struggling to adopt.
sim ⋮ 1,671 runs, 124 downloads
Download Model
Business Economics Education
1074.72
#30

Electric vehicles sales in Norway

by Daria Yermolova
This model was copied from MINDSproject: Daria Yermolova and Valentina Orliuk examine the various e ... Read more
This model was copied from MINDSproject: Daria Yermolova and Valentina Orliuk examine the various effectors on the electric car market in Norway as part of a joint project for SD304 at UIB.
model ⋮ 657 downloads
Download Model
Environment Business Technology Science Economics
982.15
#31

test

by Kenneth Keatts
Test
model ⋮ 668 downloads
Download Model
Environment Biology Business Technology Science
964.752
#32

The Shrimp Lab

by Bob Landel
“The Shrimp Commodity System Learning Lab” was designed for individuals seeking to build their syste ... Read more
“The Shrimp Commodity System Learning Lab” was designed for individuals seeking to build their systems thinking muscle and policy-design skills. It has been used successfully in undergraduate and graduate courses where business sustainability and/or system dynamics applications are emphasized. The format offers learners a progression of interactive experiences on which to build an understanding of the issues of the global shrimp industry system, including wild fisheries and aquaculture, its financial instability, the environmental issues it faces, and how individual policy alternatives can be tested, analyzed and combined to address industry performance. The Learning Lab has two learning pathways: The Systems Thinking Basics course shows the application of systems thinking and stock-flow mapping as tools to hypothesize and express underlying system feedback structures contributing to issues such as resource depletion and environmental pollution. The Policy and Scenarios Advanced course deepens understanding of systems behavioral patterns by presenting policies which address commodity systems behavior challenges and by using alternative scenarios dealing with market forces as tests. Students in a course could be asked to provide their recommendations for a policy set which best achieves multiple performance objectives: industry wide profit growth for the two industry sectors, achieve coastal effluents improvements, and avoid large oscillations of shrimp populations and resource depletion in the wild fishery. Additional information is available in the Technical Note (UVA-OM-1428) that offers information for individual preparation assignments, suggestions for Group workshop activities, helpful causality notes for instructors, and insights into policy analyses. To obtain this Note or request further information about related shrimp industry cases, (UVA OM 1388 and 1389), contact Darden Business Publishing at http://store.darden.virginia.edu/contactus The Learning Lab was developed by Chris Soderquist, Pontifex Consulting and Professor Robert D. Landel of the Darden School, University of Virginia and is based on original research from Donella Meadows Institute (formerly Sustainability Institute) and Pontifex Consulting. Copyright © 2009 by the University of Virginia Darden School Foundation, Charlottesville, VA.
sim ⋮ 7,473 runs
Environment Biology Business Economics Ecology
945.7813
#33

Production function game

by Martin Schaffernicht
You manage a toy production plant in a competitive marked (where you are a price-taker). Your goal i ... Read more
You manage a toy production plant in a competitive marked (where you are a price-taker). Your goal is to adjust production to a quantity that will yield the maximal profit, calculated by the total revenue - total costs. You have to adjust two factors: labor hours and machine hours. These factors cause costs, and they drive production (as represented by a Cobb-Douglas production function).
sim ⋮ 332 runs
Business Economics Education Schaffernicht Universidad de Talca
934.662
#34

SMBD 1-8 Fishery game

by Benjamin C.K. Chung
sim ⋮ 1,408 runs
Environment Business Ecology Education
921.5867
#35

Negative Feedback

by Franco Posa
Basic negative feedback model
model ⋮ 607 downloads
Download Model
Environment Biology Business Technology Science
894.923
#36

Tu Patineta (A) - Spanish Version

by Fabio Ponce
sim ⋮ 3,399 runs
Business Education Operations
882.69336
#37

lunar resources

by Marc-Andre
model ⋮ 1,037 downloads
Download Model
Environment Business Technology Economics
825.4033
#38

Business Model Stella Canvas

by Armando Izquierdo
A sample of how Stella Architect can be used to simulate and create an interface using as reference ... Read more
A sample of how Stella Architect can be used to simulate and create an interface using as reference the Business Model Canvas developed by Osterwalder & Pigneur
sim ⋮ 440 runs, 106 downloads
Download Model
Stella Architect Business Canvas Business Mode Sytem Dynamics Simulation
822.42
#39

Building Agile Competence Based on Training and Budget Allocation

by UiB MINDS
© Benedikt Tusch 2022
model ⋮ 560 downloads
Download Model
Business Human Resources Training Agile Competence GEO-SD304
813.07666
#40

Tanzania Dairy Investment Model

by Charles Nicholson
This is a model that allows assessment of investments in Tanzania's dairy sector from 2024 to 2030
sim ⋮ 1,322 runs
Business Technology Economics
805.72266
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Uploading a Bundle from Zip

Instead of creating bundles, categories, and assemblies one by one, you can upload a single zip file that contains all of your bundle's content. To create your zipped bundle, make a folder with your bundle's name and add subfolders with your categories' names. The folder tree should have the same structure that you want the categories to have in your bundle. Place your assembly .stmx files in the appropriate category folders, then zip your bundle folder and upload it using the Upload Bundle from Zip link above.

Assemblies, Bundles, and Categories

Assemblies are self contained models that demonstrate common ways to connect together building blocks and that can be used as parts of other models. This is analogous to using prefabricated wall and roof pieces to construct a house.

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Categories are subgroups of assemblies within a bundle. For example, a Health Care bundle might contain a Funding category for assemblies related to the management of hospital funds. All assemblies must be assigned to a category—they cannot be assigned to the root of a bundle.

Assemblies, bundles, and categories can be created and uploaded to the isee Exchange™ via the options on the Manage My Assemblies page. To learn more, visit our help pages, or take our assemblies tutorial.

Sim App (Sim)

An interface that allows users to interact with a model.

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Sim apps allow users to interact with a model using buttons, sliders, knobs, tables, graphs, and storytelling. These interactions help users understand how parts of a system interact.

Interfaces are created by model authors in the Stella desktop software and can be uploaded to the isee Exchange™.

Model

A diagram that represents how elements in a system influence one another.

Image of a model

Models are mathematical representations of how elements in a system are connected and interact (e.g., ecosystems, organizations, supply chains). When running models on the isee Exchange™, results can be viewed in output devices like graphs and tables.

Models appear in the isee Exchange™ directory when authors upload them from the Stella® desktop software or create them with Stella Online™.

Causal Loop Diagram (CLD)

A map that represents the feedback structure of a system.

Image of a CLD

CLDs are high-level maps that represents the feedback structure of a system and easily communicate the essence of a model. They appear in the isee Exchange™ when authors upload them from the Stella desktop software or create them with Stella Online™.