How does HSEEP play a role in the emergency management planning process?

Emergency management is a system of information, resources and management of consequence. It uses command and control, collaboration and decision making to restore order during disasters. Relationships and collaboration are utilized to determine the best course of action and appropriate tasks to bring about the needed response outcome.

What changes did the creation of the Department of Homeland Security bring about for the federal emergency management capacity?
How does HSEEP play a role in the emergency management planning process?