25. Name some OU design considerations.

Windows admin interview questions (includes Vista)

OU design requires balancing requirements for delegating administrative rights - independent of Group Policy needs - and the need to scope the application of Group Policy. The following OU design recommendations address delegation and scope issues:

Applying Group Policy An OU is the lowest-level Active Directory container to which you can assign Group Policy settings.

Delegating administrative authority

usually don't go more than 3 OU levels

http://technet.microsoft.com/en-us/library/cc783140.aspx