Devour data. Managers will need to have their "ears to the ground" in order to hear changes as they are coming. That means you'll need to seek out fresh sources of information, intelligence and data. You'll need to follow the example of leaders like A.G. Lafley, former CEO of Procter & Gamble, who required his top executives to go out into the field and talk to the ordinary women who use P&G products.
Read all of Alan Murray's column in The Wall Street Journal. The guidelines cited strike me as basic management, regardless of the time period.