Final answer:
In project management, the behavioral side primarily emphasizes leadership, which involves managing the human elements such as team dynamics and communication.
Step-by-step explanation:
The behavioral side of project management emphasizes leadership. This aspect deals with the human elements of a team, such as motivation, team building, communication, and conflict resolution. While scheduling, planning, and project selection are critical components of project management, they are more technical or strategic in nature. On the other hand, leadership is a core element of the behavioral side because it directly relates to managing people and their interactions within the project environment.