Planning is not one habit; it is a stack of them
Most people plan at exactly one altitude. Some live in the daily to-do list: responsive, busy, and directionless, because no list of today's tasks can tell you whether today is aimed at anything. Others plan once a year: resolutions with real direction and no traction, because January's intentions have no vehicle that carries them into an ordinary Tuesday. Both fail the same way, from different ends: a single cadence is being asked to make every kind of decision, and no single rhythm can.
The fix is a small stack of rhythms, each deciding at its own height. The idea has a distinguished ancestry: David Allen's Horizons of Focus mapped the altitudes from runway actions to life purpose, and Brian Moran's 12 Week Year made the quarter the unit of serious execution. What this guide adds is the part systems keep getting wrong in practice: not just what belongs at each level, but what each level's review is allowed to change, because that rule is the difference between a stack that steers and a stack that thrashes.