It was such a basic course that I watched it all in a week and followed along. I think it was good that it only went over the main topic without typing out the code one by one. That's why the lecture went very quickly and it was good. However, it seems that there are not many iPhone projects that can be used commercially. The mistake I made in the middle of the lecture was that I didn't add Identify. Since the skip was fast, I wish there had been an NS chart or flow chart added to handle the process by writing down the procedure a little. However, thanks to the lecture that you made in advance and the comments that you gave before the lecture, I was able to do the project practice without much difficulty. Thank you.