# What are systems dynamics models?

Table of Contents

## What are systems dynamics models?

Systems dynamics models are continuous simulation models using hypothesized relations across activities and processes. Systems dynamics was developed by Forester in 1961 and was initially applied to dealing with the complexity of industrial economic systems and world environmental and population problems.

**What can system dynamics modelling be used for?**

System dynamics is a highly abstract method of modeling. It ignores the fine details of a system, such as the individual properties of people, products, or events, and produces a general representation of a complex system. These abstract simulation models may be used for long-term, strategic modeling and simulation.

### What is the dynamic model?

The Dynamic Model describes those aspects of a system concerned with time and the sequencing of operations – events that mark changes, sequences of events, and the organizing of events and states. The Dynamic Model does not consider what the operations do, what they operate on, nor how they are implemented.

**Why do we use system dynamics?**

The purpose of System Dynamics is to help people understand complex and dynamic systems and help them make better decisions. The field provides a philosophy and tools to model and analyze dynamic systems.

#### What are the steps of system dynamics?

These are (1) model development based on influence diagram, (2) model development based on the identification of resources and their states, (3) usage of generic structures for specific domain field, and (4) component strategy for the formulation of system dynamics models.

**Why are dynamic models important?**

Because it is built up from the underlying causal processes, a dynamic model expands the Range of Thy Data to include any circumstances where the same pro- cesses can be presumed to operate. This is particularly important for projecting how a system will behave in the future.

## What are the very basic components of a systems model?

There are four basic elements to the systems model: output, process, input, and feedback. Process represents the operations that occur to transform the inputs to the desired outputs.

**How do you create a dynamic model?**

Steps in Dynamic Modeling

- Identify objective for the simulation.
- Draw a schematic diagram, labeling process variables.
- List all assumptions.
- Determine spatial dependence.
- Write dynamic balances (mass, species, energy)
- Other relations (thermo, reactions, geometry, etc.)

### What type of model is the dynamic model?

Dynamic model is represented graphically with the help of state diagrams. It is also known as state modelling. State model consist of multiple state diagrams, one for each class with temporal behavior that is important to an application. State diagram relates with events and states.