There is a strong human predisposition to assume, with the consumption of budget and the passing of time, that actual project progress is proceeding at the same pace. Sadly, facts recorded at project completion have repeatedly failed to demonstrate this correlation. Earned Value Management (EVM) is a tool that should help to solve this problem.
Delivering value with the Scrum framework for Agile product and project management approach.
In his blog post “Earned Value versus Earned Schedule“, Glen Alleman discuss the concepts of Earned Value and Earned Schedule.