I really enjoyed the lecture. It was the most helpful lecture I've seen recently. Thank you very much for preparing such a thoughtful lecture. I'm also very interested in testing and have purchased and studied several lectures and books related to testing, such as unit tests and TDD, but I was always at a loss as to how to apply what I learned to actual projects. So I thought it would be great if there was a lecture that taught how to properly introduce TDD or testing into projects, and through this lecture, I was able to grasp a major direction for TDD. Thanks to this, I feel like I can now cautiously try introducing TDD into my own projects. And I really hope a lecture on legacy code, which you briefly mentioned at the end, will also be released. A message for those considering purchasing the lecture: If you want to introduce TDD but are unsure how to proceed, this lecture will definitely be a great help.