OK I be confused. This seems, to a quick poke-around, to be all about QML. The Qt that I know, from writing a couple of apps using PyQt, is about windows and widgets made by creating instances of classes, and connecting signals to sockets and menu actions to handlers. It&#x27;s a whole different thing entirely! Like their discussion of MVP has the basic concepts but I know MVP by way of subclassing QAbstractTableModel and QTableView and QAbstractItemDelegate and so on.<p>I don&#x27;t say they are wrong to say the book is about Qt5. I am just baffled by how a Qt5 book would not even mention such things.