The main role of a BA in any company is very important for the successful completion of a project and to fulfill a client requirements which in return a value to the end user.
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The BA will acts as a facilitator between the company and client for requirements gathering when project is finalized.
BA will play a major role in the Prioritization of requirements by using MOSCOW technique.
After finalizing BA will document it into BRD/FRD depends on the company.
Design them using UML/flow charts
Developers will develop based on the user stories.
Testers will test after the development.
UAT testing is done by client side where BA will involve.
Deployment means go-live after all the requirements are satisfied.