1. Do not halt motion in both voices at the same time except at strong, conclusive cadences.
2. Although “halting on weak beats” should be avoided (see well-formedness guidelines on rhythm)—it is ok to halt in one voice while another carries the motion, in order to maintain the rhythmic separateness of voices
3. Make sure each phrase has a good balance of oblique, contrary, and parallel motion.
4. It’s ok for the voices occasionally to move in similar rhythm in order to provide contrast or relief from their constant separateness: the goal of this guideline is to produce overall separateness, not constant separateness.