3. Independence of line. The integrity of each line must be preserved. That means that the releases and legato in one line may not be influenced by the activity of another. When independence problems occur, the freezing technique is a quick and effective solution.
If you notice a break (nonlegato) where it should be legato, feel a little more weight in that part. Be on the alert for this when there is a phrase break (comma) or a break between repeated notes in only one part.
Be particularly aware of the integrity of the soprano and alto parts, since they are both played mostly by the right hand. Also, listen carefully for good legato in the alto line as it passes occasionally into the left hand.
If you hear blurring (overlegato) between any two notes (especially when the alto line passes between hands), shift a little weight out of that part. Watch out for overlegato wherever a large skip appears in the line.