Available People

This field will contain a list of users that are available to be associated with this project.  

Note regarding Inactive Users:  Users that have been set to a status of "Inactive" will not show up in the left "Available People" window.  They will, however, show up in the right "Plans For" window.  In this way, you can un-assign an inactive user if you would like.  By default, the users will remain planned even if they are set to a status of inactive.

This list can be populated / refined using the Filter feature.