Human Tasks contains extension elements and an extension activity, called the People activity, which offer the following:
Creating a task definition.
Selecting people for working on or managing a task.
Creating workflow requirements, such as deadlines and escalations.
A People activity uses a task definition and contains several other properties. The People activity can be linked to any BPEL activity or contained within a scope or other container. You can add as many People activities to a BPEL process as needed.