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## What is a model(System Model) and what is its advantages briefly discuss about three model

What is a model and what is its advantages briefly discuss about three modelBy:arunwebber

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## Answers

Model is the structural component of a system a model describes different viewpoint of a system.

**Advantages of using a model**

The model has two dimensions one is the overview of The system and another one is the overview of the model itself using thees we can easily understand the model concept.

**Three models**

**1)Class model**

It describes structure of the system in whole. It captures concepts from the real world it is using class diagram to describe itself

**2)State model**

It describes the objects concerned with time and sequence of the operation it captures control of the system that describes real world problem it is using state diagram to describe it

**3)Interaction model**

Ir describes interaction with objects it describes how individual objects collaborate to achieve the behavior of the system as whole sequence diagram and activity diagram describes the interaction model as whole.

arunwebber

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Components of system model

**Use cases**

Focuses on the functionality of system ie;What system does for the user

**Sequence diagram**

Shows the object in which it interact and the time sequence of the interaction

**Activity diagram**

Elaborates important processing steps.

metaphor

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