The giant coffee shop chain needs to make changes, and an outside perspective could help clarify what ought to be done.On July 19, The Wall Street Journal reported that activist investment firm Elliott Investment Management had purchased a sizeable (but unspecified) stake in coffee giant Starbucks (SBUX 1.00%). Over the last five years, Starbucks stock is down almost 16%. This lackluster performance is something that Elliott hopes to help correct.Investors may wonder what to expect from Elliott next. While ...