PERIAMAR has celebrated at EAWAG facilities in Dübendorf (Switzerland) a meeting to start designing a protocol for monitoring amphibians and reptiles to be applied in post-authorization risk assessment of pesticides. Experts in population monitoring and modelling, environmental fate of chemicals, toxicology and risk assessment gathered to explore aspects like monitoring goal definition, endpoint selection, environmental correlates and strategies to identify pesticide effects at the landscape level. Monitoring pesticide effects on population should become an essential pillar of an efficient risk assessment for herpetofauna.