Strong parts are almost always polarised with other parts that have conflicting strategies.
Adjacent to these polarities, mediator parts tend to arise that see the conflict—which may be causing distress and taking up a lot of energy—and think “oh no, a strong polarisation, I have to find some way of dealing with this”.
This practice is to help you get to know the parts from both sides of a polarisation. When these parts feel that they’re being understood and cared for, and their concerns are being taken seriously, they can start to relax.