Direction
Define the world you want to exist before you define your organization's mission or start shipping small deliveries: without that vision, teams will move in different directions and politics will decay all ability for innovation.
The Practice of Management
The Practice of Management is a book by Peter F. Drucker, first published in 1954. It was one of the first books to treat management as a distinct discipline, and it introduced Management by Objectives and self-control, where managers and their teams agree on clear objectives and measure their own progress against them. It also argues that the purpose of a business is to create a customer, and includes the parable of the three stonecutters.