Description about UML.

Description about UML:
1.Model:

• A model is a simplification of reality.
• A model provides the blueprints of a system.
• A model may be structural, emphasizing the organization of the system, or it may be behavioral, emphasizing the dynamics of the system.
• We build models so that we can better understand the system we are developing.
• We build models of complex systems because we cannot comprehend such a system in its entirety.
• Through modeling, we achieve four aims.
• Models help us to visualize a system as it is or as we want it to be.
• Models permit us to specify the structure or behavior of a system.
• Models give us a template that guides us in constructing as system.
• Models document the decisions we have made.

2. Principles of Modeling:

• The choice of what models to create has a profound influence on how a problem is attacked and how a solution is shaped
• Every model may be expressed at different levels of precision
• The best models are connected to reality
• No single model is sufficient. 
• Every nontrivial system is best approached through a small set of nearly independent models.

3. Unified Modeling Language (UML):  
The UML is a language for

• Visualizing.
• Specifying.
• Constructing.
• Documenting.