Explain the essence of Earned Value for projects in your context as a key input for project control. Describe the major issues that were faced, are currently a barrier for the effective use of Earned Value, or which you believe you would face trying to implement Earned Value and how these barriers were resolve or your recommendation for resolving them. (If you believe that Earned Value has no place in project management control functions, provide a concise and compelling rationale for your belief.)