Hi, Nice that I sparked some discussion. One of the reasons that I continued to write MacRuby script even though Xcode was giving me the warning that GC was deprecated is that I suspect that was a mostly a political move to appease the egos of the IOS and ARC guys and also to encourage programmers to write more efficient code. Even if Apple is determined not to support GC on the mobile devices, there is probable no really good technical reason to remove the capability for desktop apps. So I would have been surprised if Apple had removed GC in Mavericks and I still would be surprised if Apple does that anytime soon, if they do that at all. If would be a mistake, because the relative simplicity of script language programming is what makes it possible for a lonesome programmer such as myself to develop and maintain a couple of relatively large applications. The problem with RubyMotion is that it does an end-run around Xcode and since my apps do lots of initialization using NIB files it may be as much work for me to convert to RubyMotion as it will be to rewrite in objective-C. I don't have any inside information on Apple's thinking, but I suspect that may be worth the effort to upgrade MacRuby for Mavericks. I'll let you know when I find out if the App Store will still still support MacRuby apps. Bob Rice