Switch Control is one of macOS's assistive function. Generally it is for handicaped people. But it is very useful for every macOS users. It is a kind of floating palette and AppleScript launcher, keystroke player and the easiest environment to make GUI. This ebook guides how to make the Switch Control in an easy-to-understand manner. The contents of this document have been confirmed on macOS 10.14 and 10.15 (English environment).