|| WHY? Systems thinking and systems modelling are important skills to deal with and manage complexity and uncertainty. Since our world already is -and seems to become even more- complex and uncertain, we believe more people should acquire these skills.... WHY? Systems thinking and systems modelling are important skills to deal with and manage complexity and uncertainty. Since our world already is -and seems to become even more- complex and uncertain, we believe more people should acquire these skills. Acquiring these skills takes a lot of time - unless materials are available to speed up the speed of learning. Over the past decade, we have focussed on developing materials that speed up learning in systems modelling for large groups of university students and self-learners. This experience and the materials we have and are developing show that it is possible to acquire these skills rapidly - if the right materials are available. We believe these materials should be available to all. This is why we decided to develop more self-learning/workshop/teaching materials and share them via our Center of Systems Thinking. Note that materials offered here are offered as they are - without additional support. Crash courses, workshops and summer/winter schools enable one to acquire these skills in an even faster way - which is what we offer through the Policy Academy and Summer Schools (PASS) of the PEAS.Center. The Policy Academy and Summer Schools are not for free. Note that it will take time to develop your own modelling and simulation skills. If you are in need of models and simulation now, then it might be much faster to contact our Policy Modelling Lab who can do the modelling and simulation for / together with you (

|| WHAT? The Center for Systems Thinking is a center for the promotion of systemic thinking, analysis, and modelling..., and for distributing materials for teaching and life long learning related to systems thinking and systems modelling, more specifically System Dynamics modelling and Multi-Scale Modelling.

|| HOW? The Center for Systems Thinking is our vehicle for providing useful materials to (future) systems thinkers around the world FOR FREE. .... Materials and links to materials are available in the Resources section of this site. In addition, we develop tailor made crash courses, courses for policy makers and analysts, and summer/winter schools via a sister organisation (PASS, which stands for Policy Academy and Summer Schools). Via another sister organisation, the Policy Modelling Lab, we offer group model building, systems thinking and systems modelling studies, and systemic interventions. Finally, for Serious Gaming and facilitating/developing Serious Games, you are referred to the Serious Game and Playground Lab.

|| FOR WHOM? The materials offered here are for life-long learners, students, teachers, professors. Materials offered here are offered for free.... Materials and workshops offered via PASS and the PML are not for free.

|| BY WHOM? Most of the materials currently available here have been developed by dr. Erik Pruyt. Erik... obtained his PhD in modelling of complex systems from the the Free University of Brussels. In 2006, Erik joined the Faculty of Technology, Policy and Management of Delft University of Technology, the Netherlands, where he taught System Dynamics to hundreds of students each year and supervised many BSc, MSc and PhD students in modelling and simulation as well as in exploratory modeling and analysis. Some 100 of his System Dynamics teaching cases are available online through his free e-book Small System Dynamics Models for Big Issues. He hosted the 2014 and 2016 International System Dynamics Conferences and 2014/2016/2018 System Dynamics Summer Schools. On 1 October 2019, Erik quit his associate professorship at Delft University of Technology to found the and work for the world at large instead of TUDelft students only.




Introductory/Intermediate System Dynamics E-Books

|| FREE MULTI-THEME E-BOOK: "Small System Dynamics Models for Big Issues: Triple Jump towards Real-World Complexity" by Erik Pruyt..., published by the TU Delft Library, Delft, The Netherlands (ISBN/EAN: 978-94-6186-195-5). Although this e-book is first and foremost an electronic case book for those who want to learn quantitative system dynamic modelling and simulation, it is much more than "just" a set of case descriptions: it is the backbone of an online blended-learning approach. It consists of 6 concise theory chapters, short theory videos, 6 chapters with about 90 modeling exercises and cases, many demo and feedback videos, feedback sheets for each case, 5 overall chapters with feedback, 5 chapters with multiple choice questions (with graphs or figures), hundreds of online multiple choice questions, models, online simulators, and additional materials for lecturers (slides, exams, new cases). The fully hyperlinked electronic version allows students (or anybody else for that matter) to learn, in a relatively short time, how to build SD models of dynamically complex issues, simulate and analyze them, and use them to design adaptive policies and test their robustness.

|| Link to the updated e-book, e-book site, and materials (2019)

|| Link to the old e-book, e-book site, and materials (2013) [!note that the links in the e-book stopped working!]

|| E-BOOKS in our "Modelling and Simulation for Everyone" Series...: Although, generally speaking, it is better to learn modelling and simulation across many different themes (because quite often, particular structures are used over and over again in one theme), it might be much faster and more useful for people working/interested in a particular domain to learn systems modelling on cases from that particular domain. For some, it might also be easier to start from a domain they already know. To serve these professionals, we are developing the Modelling and Simulation for Everyone Series. The following e-books are either freely available, available in our Policy Academy (not for free - please contact PASS), under development, or planned to be developed. If you want to speed up the development of any of these resources by sponsoring the development of the e-book, then feel free to contact us. Note that these e-books largely correspond to the focus themes and topics of the Institute for Grand Challenges - this is indicated by the corresponding thematic image used at the Institute for Grand Challenges.

||Migration and Refugees MIGRATION

||Grand Societal Challenges SUSTAINABLE DEVELOPMENT

||Climate Change, Energy Transitions, Societal Change Energy Transitions

||Population, Population Health, Human Capital Population Health Human Capital

||Diseases and Epidemiology Diseases Health

||Sustainable Development, Circular Economies, SD Economics SUSTAINABLE DEVELOPMENT Economy Development

||Nature, Environment, Sustainable Development SUSTAINABLE DEVELOPMENT Nature Environment

||Urbanisation, Urban Dynamics, Urban Planning Urban Dynamics

||Societal Evolutions, Societal Fault Lines, Polarisation, Social Disruption Polarisation

||Governance, Institutions, Chain(ed) Organizations Governance Institutions

||Human Capital, Education, Innovation, Research and Development Education Innovation

||Peace, War, Conflict, Oppression, Crime, Public Order War Oppression

||Humanitarian Issues HUMANITARIAN

||Safety, Security and Risk GEOPOLITICS

||Policing and Public Order

||Water Related Issues Food Global Change

Separate Cases not in E-books Yet

|| Link to a case on 'Problems with Plastics'

Advanced System Dynamics E-Books

|| Advanced System Dynamics Modelling and Simulation (coming soon)

|| Modelling with System Dynamics Building Blocks

|| Exploratory Systems Modelling and Simulation (scheduled)


|| Spelen met Complexe Systemen (voor kinderen)

|| Systems Thinking in a Complex World (scheduled)

|| Multi-Scale Modelling and Simulation (scheduled)

|| Playing with Complex Systems - The Art of Building Lego Simulators (scheduled)


The Creative Learning Exchange has many materials for K12 education. See:

The System Dynamics Society has many resources. See


|| Vensim, Stella, Powersim, Anylogic, and other SD software.

|| Anysim (Multi-Scale Modelling Software).


PEAS The Center for Systems Thinking can be contacted at However, please do not contact the Center for Systems Thinking with requests for missing/additional materials. What we offer for free is available here. We do not provide additional services through this center.

PEAS The Center of Systems Thinking is one of 10 partner organisations of the PEAS.Center. You can contact the PEAS.Center at or by phone +31/(0)702042421.

PEAS If you are interested in Grand Societal Challenges looked at from a Systems Modelling perspective, then visit the Institute for Grand Challenges (

PEAS If you want one of our teams to develop and teach tailor-made courses (for individuals as well as groups) or participate in a summer/winter school, then please contact the Policy Academy and Summer Schools at

PEAS If you want us to facilitate group model building workshops or systems modelling workshops, or if you need our modelling team to develop simulation models for you, then please contact the Policy Modelling Lab at

PEAS If you are in need of storytelling or key note speakers, then please contact the Seas Of Stories at

PEAS If you are in need of serious gaming or lego simulations, then please contact: Serious Gaming and Playground at

PEAS If you are in need of data science training or solutions, then please contact the Office for Data Analysis Tools and Applications at

PEAS If you are interested in organizing an exposition bringing together Science and Art, then please contact the Center for Art and Science at

PEAS For the contact information of all PEAS.Center organisations, see:

PEAS.Center Organisations