How would you debug a 20% drop in usage of one of our tools over 2 weeks?

I would start by investigating the scope of the usage drop. Is it affecting all platforms or specific ones? If it's platform-specific, I'd focus on the underlying technology for that platform. If the drop is across all platforms, I'd then examine key metrics. This includes checking for any recent changes or bugs impacting tool functionality and usability. I'd also review user feedback, error logs, and performance data to identify potential pain points or technical issues. Finally, I'd consider external factors like competitor activity or changes in user needs that might explain the decline.