@ryo @Misato I know. But it's supposedly good for that, so it would be a good test. Doing a GUI program with it and also writing the same thing without it, and then comparing the results. That's what I want to do. And a GUI program would be good for that because it's supposedly one of the strong points of "OOP", so it's the best way to evaluate how useful or not useful it is. The fact that people say that it's good or say that it's bad is not going to influence my position in one way or the other. I have to test it myself to really know, specifically in the language and toolkit that I use (not going to be GTK, not going to be Qt).