When you try to lift the dough from the bowl with the dough hook, the entire dough should come off the bowl WITHOUT breaking. It will be VERY wet and droop down, but it should come off cleanly from the bottom of the bowl. The dough should also be shiny and smooth. And when you try to form it into a ball, it will feel more like a water balloon (think high hydration dough), than a taught, firm dough.