Environmental factors add complexity to the comparison between specific activities or entire entities. Decision making units with an inferior performance are tempted to invoke that their organization is different from the others in the data set. By reinterpreting and extending the metafrontier...

In 2007, five donors (European Commission, Belgium, Denmark, France and Luxembourg) decided to work together to evaluate their cooperation with Niger over the 2000-2008 period. Together, the five Donors taking part in the evaluation (DPE) accounted for more than half the Official Development...