The three centers can be included in two different ways in the Big Mind process:as voices to explore, and maybe even more importantly, as alive throughout the process (as a meta-skill as they call it in Process Work.)
As voices to explore
As voices to dialog with, they are the familiar Big Mind and Big Heart, and also the new (for the Big Mind process) Big Belly.
It is the seeing, loving, and feeling of all as Spirit, allowing our individual view, heart and emotions to reorganize within this new context.
When they are alive throughout the process, they allow us to see, love and feel each voice... as they are right now, and as Spirit.
There is a felt-sense of each voice, in our bodies. There is the allowing and loving of each voice, as serving the self (although sometimes a little misguided) and as Spirit. And there is the seeing of each voice, as they are right now, serving the self, and as Spirit.
Bringing all three into the process - the felt-sense, the allowing and loving, and the clear seeing - seems to allow for a deeper connection and unfolding... Each voice feels acknowledged in a more real way, allowing them to soften and reorganize to serve the self in a more fine-tuned way.
It creates a more full-bodied container for this to happen, for the vulnerable animal and all its voices to relax, feel safe, heard, understood, acknowledged, appreciated, honored, owned. Which in turn invites and allows them to reorganize to serve the self in a more finely tuned way.