The name might be similar, but there are significant distinctions between an IT Business Analyst and a Business Analyst. Some of them are:
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When compared to Business Analyst, IT Business Analyst is closely related to the SDLC (Software Development Life Cycle) and any other software processes (including Agile).
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In general, IT Business Analysts do not have the opportunity to interact directly with end-users or users of the application/system they are working on.
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On the other hand, business analysts work closely with businesses and end-users, sharing requirements with the IT Business Analyst or the Development/Implementation team directly.
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Business analysts will be involved in important pre-studies for new implementations and the preparation of Business Cases, among other things.
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Both IT Business Analysts and Business Analysts work on approaches like requirements gathering, elicitation, modeling, and prototyping. However, I believe that IT Business Analysts are more knowledgeable in these areas than Business Analysts.