The concept of 'earned value' as a project management tool has been around since the 1960s; although recognized as an important technique and widely used on US Government contracts, it failed to excite much interest in the wider world because of its specifically American requirements and the cumbersome, prescriptive bureaucracy that seemed to accompany it. Recently however, with the advent of suitable software and used in a much more flexible way, there has been a growth in interest among project managers. Crucially it has been recognised that this technique can be helpful in a wide variety...