Myleen Yumul - 2002-10-30

I am wanting to find out what rights each of the pre-defined groups have.  Is there documentation covering that? 

I need this information because I was informed by a user with Developer rights that they cannot Close an issue.  I am trying to find out how I can create/modify a group to have developer rights and also have the ability to Close an issue.

Thank you,
Myleen