Nichols S., Webb A., Norris R., and Stewardson M., 2011. Eco Evidence analysis methods manual: a systematic approach to evaluate causality in environmental science. eWater Cooperative Research Centre, Canberra. This manual describes the Eco Evidence analysis method, which is used to evaluate evidence from environmental science studies in a standardized, transparent and objective manner, which reduces bias and subjectivity. The analysis method draws together information from the studies to assess how a particular human activity or natural event may influence the environment. The information is synthesised using rules based on the ‘causal criteria’ method originally developed by epidemiologists in the 1960. The Eco Evidence analysis method guides users through an 8-step framework to gather evidence and weight it according to study design features. The evidence from many studies is then synthesised and evaluated to assess the level of support for a causal hypothesis. The Eco Evidence Analyser software is based on this method and aids in the application of the method.