Business group classificaiton

 Hi,

The following question came in mind when i done complete setup of GL,

Setup is done by the following sequence

1)Create legal entity

2)Create chart of account and enter values

3)create calendar

4)create period type and currency

5)create ledger and assign COA,CURRENCY AND CALENDER  with legal entity

6)Create business group and assign classification BUSINESS GROUP and enter the complete business group information

7)Create operating unit and assign business group to operating unit

8)assign balancing segment values to ledger

What other classification are defined in business group  and why?