There two ways to tell when dough has been kneaded well. The first is the so-called baby’s bottom test, which refers to how the surface of a neatly formed ball of dough should feel. The second is the windowpane test, which is done by positioning the thumb and index finger of each hand a few inches apart and pulling upward and outward to stretch the dough as thinly as possible. If the dough has been sufficiently kneaded, the sheet will be nearly translucent.