Answer:
planning
Explanation:
The management process in any organization consists of four main and primary function that the managers of the organization needs to focus and perform. They are :
Planning means to define the performance goals for the company and determining the plans and strategies in order to achieve that goal.
In the context, Tim Amstrong, who leads the integrated Yahoo!/AOL subsidiary is going to set a new strategic direction for the company. For this, he needs to focus on planning new organization goals and form new strategies to achieve them.
Thus he should focus on the planning of the four principal management functions.