Account setup and access

[Delao, Darryl W]

Another quick question.  I have a user in my group who I only want to grant full rights to a specific folder so he can do some testing.  I will probably have others who will want to do the same, so I have made a group called test and put them in that group.  Now what I need to do is grant that group certain access to a 1 particular folder.  I am sure there is a simple command for this but I am not sure.  Is it chown?   Darryl