System Dynamics Applications

System Dynamics Modules


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F01: Simple Stock.  This module describes a single stock (level or accumulator) with simple inflow and outflow.

F02: Cascaded Stocks.  Stocks are frequently daisy-chained together, or cascaded, in a sequence with alternating between rate-controlling variables.

F03: Transitional (Irreversible) Flow.  Transitional (irreversible) flow occurs from an initial state for a final or subsequent state.

F04: Transitional (Reversible) Flow.  Transitional (reversible) flow occurs back and forth between two stocks.

F05: First Order Linear Positive Feedback.  A first-order system contains only one stock (level or accumulator).

F06: First Order Linear Negative Feedback.  The first-order negative feedback module comprises a stock progressively depleted at a fractional decay rate.

F07: First Order Linear Negative Feedback—Explicit Goal.  The first-order negative feedback system with explicit goal contains one stock representing the state of the system of interest.

F08: First Order Delay.  The simplest view of a delay is flow through a pipeline or along a conveyor belt.

F09: Delayed Inflow.  Items (or quantities of material) arrive from outside the defined problem space.

F10: Delayed Irreversible (Transitional) Flow.  Resources related to F10: Delayed Irreversible (Transitional) Flow.

F11: First Order (Pipeline) Delay—Attrition.  This module ages a stock over a period of time, Time Delay, whilst accommodating attrition losses along the way.

F12: First Order Non-Linear Self-Referencing—Flowing In.  This goal setting module is self-referencing, the reference level being set by Maximum Possible Value of S, which is applied as an exogenous constraint.

F13: First Order Non-Linear Self-Referencing—Flowing Out.  This goal setting module is self-referencing, the reference level being set by Maximum Possible Value of S, which is applied as an exogenous constraint.

F14: First Order Non-Linear Self-Referencing.  This module combines the functionality of the First-Order Positive-Feedback Self-Referencing and First-Order Negative-Feedback Self-Referencing modules.

F15: Pipeline Delay Array.  The action of a pipeline delay can be likened to that a conveyor belt: items travelling on a conveyor belt travel for a known time and the order in which items are placed on the conveyor belt is the order in which they come off.

F16: First Order (Pipeline) Delay—Array—Attrition.  This module ages a stock over a period of time, Time Delay, whilst accommodating attrition losses along the way.

F17: Second Order (Pipeline) Delay Array—Attrition.  This module ages a stock over two sequential periods of time, Time Delay, whilst accommodating attrition losses along the way.

F50: Development Project Dynamics Module.  This module is used to analyse the dynamics of work conducted in one phase of a development project. By way of example, it focuses on the first phase of a software development project in which software coded modules are written and tested.

 

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