Some really good, and some really helpful, ideas in this one. The overall concept of focusing on 12 weeks at a time for goals and marking progress makes a lot of sense compared to the long arc of 12 months.
I’ve been trying to implement the timeframe for development of one of my side projects. Much like my experience with Getting Things Done (15 years ago!), I’d guess I will get more benefit and value from a second reading after I’ve engaged with the overall concept for a while.