Every project needs a team.  In JacobSix, you can invite others to collaborate on a project, assigning them actions to work on and allowing them to participate through messages and comments on actions.

You can invite team members using the "Invite Others" button located on the Project Page under the Menu section.  Clicking this button displays the Invitation Dialog.  Type the email addresses of those you want to invite (comma separated) and an email will be sent out with instructions on how to join the project.

Once team members accept the invitation, they can be assigned actions and also work in the project (add actions, etc.).

Team members can be removed using the Team Section under the "More..." tab.  The project owner can never be removed.  Additionally, you can remove yourself from a project by clicking the trashcan icon next to your name.