There are different goals of Modelling. Some of them are listed below:
1. Descriptive Purpose
Modelling is used to describe the problem domain we are trying to Model.

2. Prescriptive purpose: It is used to derive the details and scope of the problem under study.
3. Implementation Purpose: Model tells us how the system should be implemented.
4. Execution Purpose: Modelling can tell us about how the system project can be executed to achieve the entire functionality.

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Simulation
In the simple word, we can consider simulation as the imitation of the real world system. It is regarded as the process of constructing the model of the real world system that represent the relevant information from the system.

This model is prepared after the deep study and analysis of the real world system and can be used for the purpose of either deep study and understanding of the system or implementation of certain strategies.

The steps in simulation can be shown as follows

1. Start
2. Formulate problem and plan the study
3. Collect data and define the model
4. If conceptual model is not valid then goto step 3
              else
i. Construct computer program and verify
ii. Make pilot runs
iii. If programmed model is not valid then goto step 4
       else
i. Design experiment
ii. Make production runs
iii. Analyze output data
iv. Documentation, Presentation and Report
v. Stop


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