These were the crucial bits for me:

> "Sundays are for listing everything that went wrong during the week on the blackboard we painted on the wall of my study, so we can figure out what needs to change."

and

> "I liked to think about our life as a piece of software. We had our routines and our principles, this was the code. We ran the code by living it. The list on the blackboard was the bug log, a record of the ways our routines broke down in contact with reality. We kept going through the code until our life did what we wanted it to do, more or less."

Love the idea of bug log/dev cycle as a metaphor to use for improving relationships.