6. The computer-implemented method according to claim 1 , wherein upon creation of a second group said first tier functionality is operable to display a default expression comprising names of said first group and said second group.
6. The computer-implemented method according to claim 1 , wherein upon creation of a second group said first tier functionality is operable to display a default expression comprising names of said first group and said second group. 7. The computer-implemented method according to claim 6 , wherein said second tier functionality is operable to enable said user to modify said default expression.