[music] So companies spend millions on AI tools for software engineering. But do we actually know how well these tools work in the enterprise or are these tools just all hype. To answer this and for the past two years, we've been researching the impact of AI on software engineering productivity.And our research is time series because we look at get historical data, meaning we can go back in time. And it's also cross-sectional because we cut across companies. And the way we use to measure most of the of the ...