We are aware that our objective of having one set of indicators that can be applied to all cities has resulted in a number of compromises,particularly in relation to the evaluation of more advanced technologies for waste treatment – we could instead have come
up with two different indicator sets each optimised for the comparison of high-income cities, or of developing and emerging country cities – but we have chosen to develop a common set because
we all live in the one globalised economy where resources are finite and it is useful to compare all cities, North and South, on a common basis