Composing Your Active Directory Structure Plans
There are four basic components that make up an Active Directory structure: forests, domains, organizational units, and sites. The objective of an Active Directory Structure Plan is to create a planning document for each component of the structure, capturing important decisions and justifications along the way. These planning documents then serve as a starting point for your next planning task, migration. The four planning documents that make up the Active Directory Structure Plan are the following:
Forest Plan
Domain Plan for each forest
Organizational Unit (OU) Plan for each domain
Site Topology Plan for each forest