System Dynamics


Book Description

This book allows the reader to acquire step-by-step in a time-efficient and uncomplicated the knowledge in the formation and construction of dynamic models using Vensim. Many times, the models are performed with minimal current data and very few historical data, the simulation models that the student will design in this course accommodate these analyses, with the construction of realistic hypotheses and elaborate behavior models. That's done with the help of software Vensim that helps the construction of the models as well as performing model simulations. At the end of the book, the reader is able to: - Describe the components of a complex system. - Diagnose the natural evolution of the system under analysis. - Create a model of the system and present it using the simulation software. - Carry out simulations with the model, in order to predict the behavior of the system. Content Environmental Area 1. Population Growth 2. Ecology of a Natural Reserve 3. Effects of the Intensive Farming 4. The Fishery of Shrimp 5. Rabbits and Foxes 6. A Study of Hogs 7. Ingestion of Toxins 8. The Barays of Angkor 9. The Golden Number Management Area 10. Production and Inventory 11. CO2 Emissions 12. How to Work More and Better 13. Faults 14. Project Dynamics 15. Innovatory Companies 16. Quality Control 17. The impact of a Business Plan Social Area 18. Filling a Glass 19. A Catastrophe Study 20. The Young Ambitious Worker 21. Development of an Epidemic 22. The Dynamics of Two Clocks Mechanical Area 23. The Tank 24. Study of the Oscillatory Movements 25. Design of a Chemical Reactor 26. The Butterfly Effect 27. The Mysterious Lamp Advanced Exercises (Vensim PLE PLUS) 28. Import data from an Excel file 29. Building Games and Learning Labs 30. Interactive models 31. Input Output Controls 32. Sensitivity Analysis Annex I. Guide to creating a model II. Functions, Tables and Delays III. Frequently Asked Questions FAQs IV. Download the models of this book The author Juan Martín García is teacher and a worldwide recognized expert in System Dynamics, with more than twenty years of experience in this field. Ph.D. Industrial Engineer (Spain) and Postgraduated Diploma in Business Dynamics at Massachusetts Institute of Technology MIT (USA). He teaches Vensim online courses in http://vensim.com/vensim-online-courses/ based on System Dynamics.




System Dynamics Modelling with Vensim


Book Description

This book is the fastest and cheapest way to learn the use of Vensim. The book allows the reader to acquire step-by-step in a time-efficient and uncomplicated the knowledge in the formation and construction of dynamic models using Vensim. Vensim is the most powerful software to create simulation models based on System Dynamics. It is a very friendly software and with the guide of this book it is possible to create the first simulation model in less than 10 minutes. All the exercises are designed to achieve a fast and complete learning. No previous knowledge in mathematics or computer science is necessary.Many times, the models are performed with minimal current data and very few historical data, the simulation models that the student will design in this course accommodate these analyses, with the construction of realistic hypotheses and elaborate behavior models. That's done with the help of software Vensim that helps the construction of the models as well as performing model simulations. At the end of the book, the reader is able to:1. Describe the components of a complex system. 2. Diagnose the natural evolution of the system under analysis. 3. Create a model of the system and present it using the simulation software. 4. Carry out simulations with the model, in order to predict the behavior of the system.The content of this book can be applied in many areas. In the business world, these topics are mainly used to address issues related to Strategic Planning, Business Planning, Leadership Development, Strategic Marketing and Sales, Organization Redesign, Process Improvement, Implementation of operational plans. In general to build and sustain high performance over the long term, and ensure successful implementation of changes. In the academic world, these topics may be used to develop Final Projects or Doctorate, theses on diverse subjects.Index of items Environmental Area3.1. Population Growth 3.2. Modeling the Ecology of a Natural Reserve 3.3. Effects of the Intensive Farming 3.4. The Fishery of Shrimp 3.5. Rabbits and Foxes 3.6. A Study of Hogs 3.7. Ingestion of Toxins 3.8. The Barays of Angkor 3.9. The Golden Number Management Area3.10. Production and Inventory 3.11. CO2 Emissions 3.12. How to Work More and Better 3.13. Managing Faults 3.14. Project Dynamics 3.15. Innovatory Companies 3.16. Quality Control 3.17. The impact of a Business Plan Social Area3.18. Filling a Glass 3.19. A Catastrophe Study 3.20. The Young Ambitious Worker 3.21. Development of an Epidemic 3.22. The Dynamics of Two Clocks Mechanical Area3.23. The Tank 3.24. Study of the Oscillatory Movements 3.25. Design of a Chemical Reactor 3.26. The Butterfly Effect 3.27. The Mysterious Lamp Advanced Exercises (using Vensim PLE PLUS)3.28. Import data from an Excel file 3.29. Building Games and Learning Labs 3.30. Interactive models 3.31. Input Output Controls 3.32. Sensitivity AnalysisIndex of itemsDefined FunctionsSTEPMIN-MAXPULSEIF THEN ELSERANDOMRAMPABSEXPXIDZANDDELAY-SMOOTHTables or LookupsInternal table External tableModel SettingsInitial time not 0Units CheckTime Step valuesStock and Flow DiagramDraw a bi-flowMerge modelsShadow variablesCounter of TimeMultiple viewsAdd commentsInitial value of a StockQualitative variablesCausal Loop DiagramImages on the SFDCurved flowsDelay markSimulationsCompare simulationsReference Mode Simulate SetupSyntheSimIntegration methodOutputsOutput graphsOutput tablesCauses-strip toolLine MarkersX-Y graph




System Dynamics Modeling with R


Book Description

This new interdisciplinary work presents system dynamics as a powerful approach to enable analysts build simulation models of social systems, with a view toward enhancing decision making. Grounded in the feedback perspective of complex systems, the book provides a practical introduction to system dynamics, and covers key concepts such as stocks, flows, and feedback. Societal challenges such as predicting the impact of an emerging infectious disease, estimating population growth, and assessing the capacity of health services to cope with demographic change can all benefit from the application of computer simulation. This text explains important building blocks of the system dynamics approach, including material delays, stock management heuristics, and how to model effects between different systemic elements. Models from epidemiology, health systems, and economics are presented to illuminate important ideas, and the R programming language is used to provide an open-source and interoperable way to build system dynamics models. System Dynamics Modeling with R also describes hands-on techniques that can enhance client confidence in system dynamic models, including model testing, model analysis, and calibration. Developed from the author’s course in system dynamics, this book is written for undergraduate and postgraduate students of management, operations research, computer science, and applied mathematics. Its focus is on the fundamental building blocks of system dynamics models, and its choice of R as a modeling language make it an ideal reference text for those wishing to integrate system dynamics modeling with related data analytic methods and techniques.




Modeling for Learning Organizations


Book Description

Conventional wisdom says that we can learn from our errors, but errors in the business world can be prohibitively costly. To truly understand how complex business organizations function requires different tools than most managers have been given. Yet managers need methods to understand how their organization works in order to test policies, discover flaws in thinking, and find the hidden leveragepoints within the complex systems they manage. Through a system simulation, the dynamics of the whole system, not just the individual parts, becomes apparent. The outcome of current and future situations becomes possible to predict and with this information, managers can focus on the changes that need to be made. The distinguished contributors to Modeling for Learning Organizations include Jay W. Forrester, Peter Senge, and Arie De Geus. You will learn about leading applications such as: Shell's work on modeling the oil producers. The Management Flight Simulator, a computer-based case learning environment pioneered by John Sterman and others at MIT The landmark Claims Learning Laboratory at Hanover Insurancecompanies. For managers, professionals, academicians, and everyone who recognizes the profound implications of modeling, this book is an excellent resource. It offers a broad understanding of the modeling process, discusses a multitude of case studies, and provides a review of the most recent simulation software.




System Dynamics


Book Description

This book covers the broad spectrum of system dynamics methodologies for the modelling and simulation of complex systems: systems thinking, causal diagrams, systems structure of stock and flow diagrams, parameter estimation and tests for confidence building in system dynamics models. It includes a comprehensive review of model validation and policy design and provides a practical presentation of system dynamics modelling. It also offers numerous worked-out examples and case studies in diverse fields using STELLA and VENSIM. The system dynamics methodologies presented here can be applied to nearly all areas of research and planning, and the simulations provided make the complicated issues more easily understandable. System Dynamics: Modelling and Simulation is an essential system dynamics and systems engineering textbook for undergraduate and graduate courses. It also offers an excellent reference guide for managers in industry and policy planners who wish to use modelling and simulation to manage complex systems more effectively, as well as researchers in the fields of modelling and simulation-based systems thinking.




Theory and Practical Exercises of System Dynamics


Book Description

As the complexity of our world increases systems thinking is emerging as a critical factor for success, and even survival. How then can people become skilled systems thinkers? The most effective learning experiences combine experience with reflection, theory with practice. Traditionally, theory was taught in school and university, and experience was gained in life outside those walls. But in the world of complex dynamic systems such as a business, society, or ecosystem, everyday experience fails because the time horizon and scope of the systems is so vast-we never experience the majority of the effects of our decisions. And without relevant experience, theory is uninteresting to students. The old ways of learning fail. When experiments in the real world are impossible, simulation becomes the main way we can learn effectively about the dynamics of complex systems. For this reason I'm pleased to introduce Juan Martin Garcia's book 'Theory and Practical Exercises of System Dynamics'. Juan combines theory and practice, experience and opportunities for reflection, so that newcomers to the field can learn for themselves how complex dynamic systems work. The examples span a range of important economic and social issues, from the aging of the population in developed economies to the course of contagious diseases to the accumulation of pollutants in the environment; everyone will find some examples here of direct personal interest. The modeling exercises guide the learner through the process of building a working simulation; students will not only learn about the issues addressed, and in the use of state of the art simulation software, but will develop skill in the modeling process. Juan has written a delightful first introduction to the field of system dynamics and complexity, and provides a much-needed addition to the literature available. John D. Sterman Index System Dynamics - Identifying the Problem - Defining the System - The Boundaries of a System - The Causal Diagram - Feedback - The Limiting Factor - The Key Factors - Classification of Systems - Generic Structures - World Models Building a Model - Flow Diagrams - Computer Simulation - Behaviour of the Model - Analysis of the System - Weaknesses of Models Guide to Creating a Model - Creating a Causal Diagram - Creating a Flow Diagram - Writing the conclusions Environmental System Dynamics - Population Growth - Modeling the Ecology of a Natural Reserve - Effects of the Intensive Farming - The Fishery of Shrimp - Rabbits and Foxes - A Study of Hogs - Ingestion of Toxins - The Barays of Angkor Management System Dynamics - Production and Inventory - Global CO2 Emissions - How to work more and better - Managing of Faults - Project Dynamics - Innovatory Companies - Quality Control - The impact of a Business Plan Social System Dynamics - Filling a Glass - Dynamics of a Segmented Population - The Young Ambitious Worker - Development of an Epidemic - The Dynamics of Two Clocks Mechanical System Dynamics - Dynamics of a Tank - Study of the Oscillatory Movements - Design of a Chemical Reactor The author Juan Martín García is a teacher and worldwide recognized expert in System Dynamics, with more than twenty years of experience in this field. Ph.D. Industrial Engineer (Spain) and Postgraduated Diploma in Business Dynamics at Massachusetts Institute of Technology MIT (USA). He teaches Vensim online courses in http://vensim.com/vensim-online-courses/ based on System Dynamics.




Supply Chain Simulation


Book Description

Supply Chain Simulation allows readers to practice modeling and simulating a multi-level supply chain. The chapters are a combination of the practical and the theoretical, covering: knowledge of simulation methods and techniques, the conceptual framework of a typical supply chain, the main concepts of system dynamics, and a set of practice problems with their corresponding solutions. The problem set includes illustrations and graphs relating to the simulation results of the Vensim® program, the main code of which is also provided. The examples used are a valuable simulation tool that can be modified and extended according to user requirements. The objective of Supply Chain Simulation is to meet the demands of supply chain simulation or similar courses taught at the postgraduate level. The “what if” analysis recreates different simulation scenarios to improve the decision-making process in terms of supply chain performance, making the book useful not only for postgraduate students, but also for industrial practitioners.




Business Dynamics: Systems Thinking and Modeling for a Complex World with CD-ROM


Book Description

Today’s leading authority on the subject of this text is the author, MIT Standish Professor of Management and Director of the System Dynamics Group, John D. Sterman. Sterman’s objective is to explain, in a true textbook format, what system dynamics is, and how it can be successfully applied to solve business and organizational problems. System dynamics is both a currently utilized approach to organizational problem solving at the professional level, and a field of study in business, engineering, and social and physical sciences.




Common Mistakes in System Dynamics


Book Description

Creating a simulation model with System Dynamics is not easy, there is the risk of making serious mistakes that force the model to remain unfinished after having dedicated days of work. There are books and courses which show the steps to be taken in the process of creating a simulation model, but it is observed that some errors are repeated frequently. This book offers a different approach, instead of explaining how to create a simulation model, it shows the mistakes that are usually made. The book is designed for students who are looking for a quick manual to identify the most common mistakes made when creating simulation models by applying System Dynamics, to correct them before presenting their research or work. The experts will find in this book a list of points to check before making a presentation to their clients.The content of the book allows the reader to identify the errors described and take them into account before submitting or publishing a work. The most essential book for beginners and experts Content Causal Loop Diagram CLD 1. Guidelines 2. Definition of the elements 3. Loops and causal chains 4. Variable that depends on many 5. Variables in a positive sense 6. Variables that do not influence anything 7. Variables with signs 8. Confusing diagrams Stocks and Flows Diagram SFD 9. Guidelines 10. One variable only once 11. Coherence of flows and their levels 12. Flow concept 13. Levels without flows, flows without levels 14. Levels only depend on flows 15. Arrows with signs 16. Uppercase for everything 17. Clouds that depend on variables 18. Variables that depend on two tables 19. It depends, but it is constant 20. Do not look up from the paper 21. Badly connected flows 22. Impossible values The author Juan Martín García is teacher, consultant, and a worldwide recognized expert in System Dynamics, with more than twenty years of experience in this field. Ph.D. Industrial Engineer (Spain) and Postgraduated Diploma in Business Dynamics at Massachusetts Institute of Technology MIT (USA). He teaches Vensim online courses in http://vensim.com/vensim-online-courses/ based on System Dynamics.




Corporate Governance Models and Applications in Developing Economies


Book Description

Virtually all developing, transitioning, and emerging-market economies are faced with one pressing concern at the moment: how to establish the groundwork for long-term economic performance and competitiveness in a diverse market. However, without the existence of good corporate governance in these economies, small enterprise will cease to exist in developing countries. Corporate Governance Models and Applications in Developing Economies is a collection of innovative research that contributes to the better understanding of corporate governance models by documenting the structures, principles, tenets, case studies, and applications for the development of good business practices in developing economies. While highlighting topics including risk management, financial distress, and insider trading, this book is ideally designed for corporate managers, executives, economists, strategists, investors, shareholders, students, researchers, academicians, business professionals, and policymakers.