This document provides an overview of system dynamics and systems thinking. It defines key terms like systems, static vs dynamic systems, feedback loops, stocks and flows. Systems thinking focuses on how parts of a system interrelate and how systems work over time. System dynamics uses feedback loops and stocks/flows to model how complex systems change over time. It involves conceptualizing the system, formulating stock/flow diagrams, testing the model, and implementing it to test policies. Causal loop diagrams and stock/flow diagrams are introduced as tools to understand system structure and behavior.
Introduction to Systems Thinking: System Structures and BehaviourJason Yip
Presentation for the Sydney Limited WIP Society
An introduction to Systems Thinking for people who I assume are familiar with designing, building IT systems and/or the mess of large organisations
Targeting beginners OR a review of fundamentals for non-beginners
Systems Engineering is a very broad , overarching, and generally applicable engineering discipline. Many types of systems are developed using SE. These include biomedical systems, space vehicle systems, weapon systems, transportation systems, and so on.
Systems Engineering involves the coordination of work performed by engineers from all other engineering disciplines (electrical, mechanical, computer, software, etc.) as required to complete the engineering work on the project/program.
Introduction to Systems Thinking: System Structures and BehaviourJason Yip
Presentation for the Sydney Limited WIP Society
An introduction to Systems Thinking for people who I assume are familiar with designing, building IT systems and/or the mess of large organisations
Targeting beginners OR a review of fundamentals for non-beginners
Systems Engineering is a very broad , overarching, and generally applicable engineering discipline. Many types of systems are developed using SE. These include biomedical systems, space vehicle systems, weapon systems, transportation systems, and so on.
Systems Engineering involves the coordination of work performed by engineers from all other engineering disciplines (electrical, mechanical, computer, software, etc.) as required to complete the engineering work on the project/program.
A cellular automaton is a discrete model studied in computer science, mathematics, physics, complexity science, theoretical biology and microstructure modeling.
This presentation is a basic introduction.
Software maintenance and configuration management, software engineeringRupesh Vaishnav
Types of Software Maintenance, Re-Engineering, Reverse Engineering, Forward Engineering, The SCM Process, Identification of Objects in the Software Configuration, Version
Control and Change Control
An introduction to system dynamics & feedback loopbhupendra kumar
System dynamics focuses on the structure and behavior of systems composed of interacting feedback loops.
System Dynamics helps in designing the interconnections and structures to give more confidence and predictability in behavior of the systems.
A cellular automaton is a discrete model studied in computer science, mathematics, physics, complexity science, theoretical biology and microstructure modeling.
This presentation is a basic introduction.
Software maintenance and configuration management, software engineeringRupesh Vaishnav
Types of Software Maintenance, Re-Engineering, Reverse Engineering, Forward Engineering, The SCM Process, Identification of Objects in the Software Configuration, Version
Control and Change Control
An introduction to system dynamics & feedback loopbhupendra kumar
System dynamics focuses on the structure and behavior of systems composed of interacting feedback loops.
System Dynamics helps in designing the interconnections and structures to give more confidence and predictability in behavior of the systems.
Using synthesis (System Thinking) to find business problemsNatty Gur
A process that detailed all the aspects needed to cover to conduct synthesis for a business/organization. This presentation describes the process we are using (at Galaxies), including the type of data we are looking for and toolset. We hope you can use this data to find problems in your organization.
With the rapid increase in performance of computers over the last few years it is unlikely that any business will survive without some means of computerised data processing in the future.
It is therefore very important that any person planning and involved in any career in today’s commercial environment is provided with a basic understanding of computer technology and the theory of Management Information System (MIS).
Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
How to Fix the Import Error in the Odoo 17Celine George
An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
This presentation was provided by Steph Pollock of The American Psychological Association’s Journals Program, and Damita Snow, of The American Society of Civil Engineers (ASCE), for the initial session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session One: 'Setting Expectations: a DEIA Primer,' was held June 6, 2024.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
2. • What is a system?
• A set of elements that is coherently organized and
interconnected in a structure that produces a characteristic
set of behaviors.
• Static system:
• The output of the system depends only on the current
input.
• The output does not change with the time if the input is
held constant (time-invariant)
• Dynamic system
• The output of the system depends on the current and the
previous input.
• The output changes with the time even if the input is
constant (time varying)
3. Systems Thinking
Definition: Systems thinking is a holistic approach to analysis
that focuses on the way that a system's constituent parts
interrelate and how systems work over time and within the
context of larger systems
• We quickly determine a cause for any event that we think is
a problem. Usually we conclude that the cause is another
event.
• –Example: Sales are poor (event) because staff are
insufficient motivated (cause); staff are insufficient
motivated (event) because ...
•Difficulty: You can always find yet another event that caused
the one that you thought was the cause. This makes it very
difficult to determine what to do to improve performance.
4. • Decision making uses feedback loop,
It is not an open loop process.
• Decision taken puts a system into
new state, the side effects caused
to current state leads to new
decisions.
6. Systems Thinking
•Idea of Systems Thinking:
–Move away from looking at isolated events and their causes .
–Look at the organization as a system made up of interacting parts
–Internal structure of the system is often more important than
external events in generating the problem
–If we shift from the event orientation to focusing on the internal
system structure
--we improve our possibility of improving system performance as the
system structure is often the underlying source of the difficulty.
•Systems Thinking: The process of understanding how things influence
one another within a whole
7. WHAT IS SYSTEM DYNAMIC
SIMULATION?
• Systemdynamics(SD)is a methodology to explore complexity,
Interconnectedness,and change in a system overtime.
• It deals with internal feedback loops and time delays that
affect the behavior of the entire system.
• The basis of the methodology is the recognition that the
structure of any system (relationships amongst its
components) is just as important in determining its behaviour
as the individual components themselves.
• Developed in the late 1950s by MIT Professor Jay Forrester.
• SD is an extension of systems thinking.
• With SD we can analyze the possible effects of our models,
given different assumptions, policies, constraints, etc.
8. • System dynamics focuses on the structure and
behavior of systems composed of interacting
feedback loops.
• System Dynamics helps in designing the
interconnections and structures to give more
confidence and predictability in behavior of
the systems.
9. WHAT IS THE DIFFERENCE BETWEEN
ST AND SD?
• Systems thinking and system dynamics are two sides of the
same coin.
• Systems thinking focuses on exploring interrelationships,
including creating causal loop diagrams and behavior over
time graphs, without the need for computer software.
• System dynamics employs systems thinking outputs such
as causal loop diagrams to focus on building and analyzing
stock and flow
• System dynamics -which incorporates systems thinking-
teaches us better thinking. It results in better analysis and
greater understanding.
• 1st step: How to think? ST
• 2nd step: How to model? SD
10. SYSTEM DYNAMICS MODELING
Conceptualization
–Define the purpose of the model
–Define the model boundaries and identify key variables
–Describe the behavior of the key variables
–Diagram the basic mechanisms (feedback loops) of the system
Formulation
–Convert diagrams to stock and flow equations
–Estimate and select parameter values
–Create the simulation model
Testing
• –Test the dynamic hypothesis (the potential explanation of how structure
is causing observed behavior)
• –Test model behavior and sensitivity to perturbations
Implementation
• –Test model's responses to different policies
• –Translate study insight to an accessible form
11. • CRITICAL ASPECTS:
• Thinking in terms of cause-and-effect
relationships
• Focusing on the feedback linkages among
components of a system
• Determining the appropriate boundaries for
defining what is to be included within a system
• Model representations
• –Causal loop diagrams (qualitative)
• –Stock and Flow diagrams (quantitative)
• Example: Simple causal loop diagram of
food intake
• if cause increases ... effect decreases (+)
• if cause increases ... effect increases(-)
12. Assumptions in SD
System Dynamics modeling is predicated on a number of assumptions
• The feedback loops are sufficient to explain complex system
behavior
• The SD is modeled through a process of direct or indirect
engagement of domain experts through following approaches.
1.Interviews
2.Group model building workshops
3.Analysis of written document
• Reference model of behavior can be used for prediction
• To improve the outcome feedback paths can be introduced or
removed.
13. UNDERSTAND CAUSE & EFFECT
• Some are logical
• Food intake-> weight
• Money -> betterlife
• Fire -> smoke
• Some are not
• Use of seatbelts ->reduced highway fatalities
14. FEEDBACK LOOP STRUCTURES
• Thinking in terms of “cause and effect” is not enough
• ocean -> evaporation ->cloud -> rain -> ocean -> …
• Feedback: an initial cause ripples through a chain of
• causation ultimately to re-affect itself
• Search to identify closed, causal feedback loops is one
key element of System Dynamics
• The most important causal influences will be exactly
those that are enclosed within feedback loop
15. Feedback and Causal Loop Diagrams
• Feedback loop or causal loop: Element of a system indirectly
influences itself
17. AUGMENTING CLD 1
(LABELING LINK POLARITY)
• Signing: Add a ‘+’ or a ‘–’ sign at each arrowhead to
convey more information-Causal link
• A ‘+’ is used if the cause increase, the effect increases
and if the cause decrease, the effect decreases (or)
Causal link from element A to B is positive (+ or s) if
either A adds to B or a change in A produces a change
in B in the same direction
• A ‘-’ is used if the cause increases, the effect
decreases and if the cause decreases, the effect
Increases (or) Causal link from element A to B is negative
(- or o) if either A subtracts from B or a change in A
produces a change in B in the opposite direction
19. • Feedback loop
• –A feedback loop is positive or reinforcing (+ or R) if it
contains an even number of negative causal links (e.g. growth
of bank balance )
• Notation: place symbol (+)
in the center of the loop
20. • A feedback loop is negative or balancing
(- or B) if it contains an uneven number of negative causal links
• Notation: place symbol (-)
in the center of the loop
22. There are two feedback loops in this diagram.
The positive reinforcement (labeled R) loop on the right indicates that the
more people have already adopted the new product, the stronger the word-
of-mouth impact.
There will be more references to the product, more demonstrations, and
more reviews. This positive feedback should generate sales that continue to
grow.
The second feedback loop on the left is negative reinforcement (or
"balancing" and hence labeled B).
Clearly, growth cannot continue forever, because as more and more people
adopt, there remain fewer and fewer potential adopters.
23. EXOGENOUS ITEMS
• Items that affect other items in the system but are not themselves
affected by anything in the system
• Arrows are drawn from these items but there are no arrows drawn to
these items
24. DELAYS
• Systems often respond sluggishly
• From the example below, once the trees are planted, the harvest rate can
be ‘0’ until the trees grow enough to harvest
25. Stock and flow diagrams
• Stock and flow diagram:
–Shows relationships among variables which have the potential to
change over time (like causal loop diagrams)
–Distinguishes between different types of variables (unlike causal loop
diagrams
• Stocks (also known as levels, accumulations, or state variables)
{Symbol: Box} are the foundation of any system and are the elements
that you can see, feel, count, or measure.
• Stocks do not have to be physical
• Value of stock changes by accumulating or integrating flows
• Physical entities which can accumulate and move around (e.g.
materials, personnel, capital equipment, orders, stocks of money)
26. • Flows (also known as rates, activity, movement) {Symbol: valve} , change
the value of stocks. In turn, stocks in a system determine the values of
flows.
• A stock is the present memory of the changing flows within the system.
• Flow or movement of the "something" from one stock to another
• The value of a flow is dependent on the stocks in a system along with
exogenous influences
• Information {Symbol: curved arrow}
• Between a stock and a flow: Indicates that information about a stock
influences a flow
27. • Stock and flow diagram for :Growth Of
Population
28. • Assuming the birth and death loops, Draw an
stock and flow diagram, assume chicken dies
by road crossing.
32. Stock
• Stock is defined as a variable
that is measured at a
particular point in time
• Stock does not have a time
dimension attached with it.
• Stock is static in nature.
• Stock influences the flow, as
such greater amount of capital
will lead to greater flow of
services.
• Bank deposits, capital, wealth,
population
Flow
• Flow is defined as a variable
which is measurable over a
period of time
• Flow has a time dimension
attached with it.
• Flow is dynamic in nature.
• Flow influences the stock, as in
increased flow of money supply
in an economy results in increase
in the quantity of money
• Capital formation, income,
interest on capital, depreciation
33. Accounting, finance:stock and flow
“Stock" "Inflow(s)" "Outflow(s)"
bank balance
deposits
interest
withdrawals
housing stock housing investment housing depreciation
equity shareholdings purchases of shares sales of shares