Modeling is the process of capturing your business design from an understanding of business requirements and objectives and translating that into a specification of business processes, goals and assumptions – creating an encoded model of your business. As we indicated above, many businesses do not go through a formal modeling exercise. 
Capturing your business design using a rigorous approach offers the potential to gain better insight into your business, For example we can use the model to simulate how your business processes will actually run. A well made model will lets you perform ‘what-if’ scenarios that reflect your understanding of the actual number of process instances, contacts, quantities, incoming traffic, etc. that you may experience in your business. The process can then be simulated using those parameters to predict the effect that process will have on your business and on your IT systems. If you don’t achieve the results you expected then you can change your process definition to try to improve your results. You can go on to refine your processes to optimize your business performance even before ever investing in an implementation of those processes.

Your model can also capture key performance indicators like business metrics that are important measurements of your business. These key performance indicators are input to the assembly of your application and later, when the application is in production, collected and reported back to you. You will be able to use that information to determine how well your business is performing. You can use the correlation between your business design in your actual implementation in the information system to determine whether bottlenecks in your performance are due to limitations in your business design or limitations in the information system that automates your design. 
Roles performed in this stage:

Business Analysts
Uses WebSphere business Modeler product
• Analyze business requirements
• Model business processes

IT Analysts/Software Architect
Uses Rational Software Architect product
• Transform business models to service models
• Design service models
• Transform service models to service artifacts

Integration Specialist
Uses WebSphere Integration Developer product
• Develop service integration solutions for SOA
The business analyst will provide business models to IT Analyst in turn IT analyst will provide Service Artifacts to Integration Specialist.

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