Long-term plans are often too rigid. They lack the ability to adapt to the constantly changing needs and environment of the business. Discipline 2 requires you to define the daily or weekly measures, the achievement of which will lead to the goal.
Then, each day or week, your team identifies the most important actions that will drive those lead measures. In this way, your team is creating a just-in-time plan that enables them to quickly adapt, while remaining focused on the WIG.