It depends on your scenario. You can use BODS and BW, but it seems like overkill to me most of the time. You can even setup BODS as a source system and use it to extract data directly in BW. I'd say it is really only useful if you have complex extraction requirements from non-SAP systems, although there are a million other ways you could solve these challenges. Where I work we have BW, BODS, and all the BI tools, although I don't think I'd recommend this setup to others unless they have a very good use case for why they need all of it.
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