Wherry organizes her thoughts on managerial mistakes by documenting problems at different levels of an organization's management hierarchy. Here, for example, is the hierarchy at Meebo, along with a few words of advice from Wherry: Individual code writer ("Don't turn down anyone offering help") Manager ("Stop trying to do your old job") Director ("Don't promote someone and then disappear") Vice president ("Don't reverse a plan midstream") CEO ("Never let your guard down") How is this level-by-level approach reflected in the kinds of mistakes that Wherry identifies? Why is this approach effective in identifying mistakes? How can it be effective in avoiding mistakes