Double-checking is a very basic and useful method. But if senior employees are in charge of checking all drafts that come their way, it may be too much of a burden. This kind of system may result in a supervisor's tendency to "approve without actually reading."
So let's use peer reviews instead. This way the newsletter can be sent out regularly even when the boss is out for the day. It also eliminates mistakes. Of course, the boss may want to check important ones just to be sure, so we made the process model send drafts marked *important* along to the supervisor's [2b. Check] task.