While it is often preferred to leave (certain) administrative procedures outside the plan document, in my experience advising clients on claims, litigation, and related matters, it may be most protective of the plan sponsor to have certain administrative procedures set forth in the plan document if they involve areas that may be challenged by participants (or others) in the future. That of course assumes that the client/plan sponsor intends to follow the terms of the plan and not make "administrative exceptions" in response to requests by more senior executives. From the plan sponsor's perspective, addressing a claim involving, e.g., a hardship distribution, with reference to specific plan provisions (as opposed to some non-disclosed administrative procedure) will more often than not provide the necessary support for actions taken (if consistent with plan provisions). Reference in the plan document will also result in disclosure in the SPD so that participants (and others to whom the SPD is provided) will be on notice of how the plan is to be operated regarding hardship distributions.