As a policy is standardized or developed, it goes through a rigorous review and approval process. The responsible executive writes an impact statement, which is approved by the Executive Policy Review Group (EPRG). Then the editorial process takes place, during which the policy is "fleshed out." The Policy Advisory Group (PAG) then approves the policy, making any necessary changes. The EPRG is the final approving body, putting its stamp on the document. The entire process often takes six months or more.