Waiting for list: tracking things to be done by others
Your Waiting for list contains all the actions that you are waiting to get done by others.
Mark an action as waiting for
In order to create a waiting for action click "Waiting for" and assign a delegate to the action:
See your list of waiting for actions
There is a section in the Review and Organize panel:
Manage the list of people you can delegate to
You can edit the people you can delegate to in the Preferences, in the section labeled "Delegated users":