In agile terminology the notion of business analysis is usually avoided. In agile environments diverse teams cooperate, focusing on quick production of value and working software over comprehensive documentation.
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One of my favorite tools I always use when starting on a new project is the RACI Matrix. It's quite obvious to define the stakeholders roles and responsibilities when you join a new organization,
There are a lot of great books about Business Analysis out there. But only few of them are really adding something new to the field. Let me give you a list of my favourites.