MDM clarifications

Hi All,

Can anybody help me in understading the below issues.

1.When to go for qualified table and when to go for normal lookup table? What is the exact difference?.

2.The MDM XI content only has the employee object interface. What about the other objects like material, customer?. Why is it not delivered as part of the XI content?

3. Which is the preferred place for mapping i.e. in MDM syndicator or XI mapping step?. For example material, vendor .....object mappings are delivered as part of MDM where as the employee object has XI content. Which solution we have to advice the customers?

Sreekanth