Measuring impact in complex and unpredictable environments is notoriously difcult and often consumes a high level of resources.

- What tools and methods are already available in sustainability and other fields of behaviour change?

- How we can use resources prudently to evaluate the effectiveness of our work?

- A whistle-stop tour of leading evaluation resources and tools profiled at two recent conferences – the World Social Marketing Conference (Dublin) and the Australasian Evaluation Society Conference (Sydney).