Identifying defects in software requirements

I'm presenting my Master's thesis in a couple of weeks on identifying software defects during the requirement phase. Most of my research has been based on the papers written by other academics. I want to understand what actually happens in the industry. How are inspections done in the requirements phase? How are things different in the traditional waterfall method vs newer agile frameworks?

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Any helpful points from your industry experience would be really helpful.

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P.S. my research peer and I have developed a tool to identify defects from the requirement docs. DM me if you are interested in checking it out. I'll send you the link.