My husband works three jobs so I can write. Finally, after months of him being too busy to do anything but work and sleep, he and I sat down and blocked out the new novel properly.  We discussed the character arcs and the 'truth' of each story thread and the tie up at the end.  He listened to my wackiest, craziest ideas and gives me honest feedback.  He saved me from deleting 110 thousands words because I'm tired and want to do something stupid and self destructive.  
That's why he gets the biggest thanks in the Acknowledgements.  Without him I couldn't writexxxx