Systematic reviews are widely accepted as a ‘gold standard’ in evidence synthesis and the meta-analysis within provides a powerful means of looking across datasets. Neal Haddaway argues that while certain fields have embraced these reviews, there is a great opportunity for their growth in other fields. One way to encourage secondary synthesis is for researchers to ensure their data is reported in sufficient detail. Thinking carefully about legacy and future use of data is not only sensible, but should be an obligation
