Previously, employees were reviewed twice a year on a five-point scale, plotted on a distribution curve, which determined workers' bonuses.

WSJ: Performance Reviews Lose Steam

She said it would be unrealistic to expect agencies facing an "extremely steep learning curve", with little experience of construction on this scale, to get things 100% right first time.

BBC: UK aid 'left legacy' after 2004 tsunami in Asia

Intermediaries who can package and deliver products to large-scale wealth holders with the objective of running down the cost curve are one solution.

FORBES: Banks Need to Play a Larger Role in Social Good