GPO processing order

GPO's don't apply all at once. Group Policies follow the following hierarchical processing order.
  1. 1.
    First there are local Group Policies
  2. 2.
    Second are site Group Policies
    Multiple Site policies are processed synchronously in the listed preference order
  3. 3.
    Third Domain Group Policies
    Multiple Domain policies are processed synchronously in the listed preference order
  4. 4.
    Fourth policies are OU Group Policies
    Multiple OU policies are processed synchronously in the listed preference order
  5. 5.
    Fifth last are child OU Group Policies
    Multiple Child OU policies are processed synchronously in the listed preference order
  6. 6.
    Last policy applied Wins