A single page listing what will actually be done in the next month, by whom, by when. It works because thirty days is too short to procrastinate in.
An annual plan has a fatal property: everything in it can be started later. A thirty-day plan cannot be deferred without visibly failing, which is precisely why it produces action.
The format is deliberately spare. Three to five actions, a named owner for each, a date, and how you will know it is done. Anything longer is a wish list.
The pairing that matters is the review. A thirty-day plan with no thirty-day review is just a list. The review is where accountability actually lives — see [the five A's of change].
Both work and they do different jobs. Ninety days is the planning horizon; thirty days is the execution horizon. The month is where the quarter either happens or does not.