Active Directory Design

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http://serverfault.com – Please assist me in how I design my active directory hierarchy based on the following. We have a corporate office where there 8-10 departments and 200+ <250 users are present. We have two factories and one site office in different geographical locations. They all are connected via VPN. In our factory there is an average of 150 users and in the site office there are 30/35 users. Currently we are planning to implement AD in our head office only. But we must consider the future development in our factory and site office. All our PCs are Windows XP and few of them are Win7 we are slowly migra (HowTos)