GMO Monitoring was made mandatory in the European Union. The according regulatory practice, however, is still under development. Recently, the European Food Safety Authority completed a guidance document which attempts to specify the requirements for general surveillance, i.e. the monitoring aspects that go beyond case-specific issues. While case-specific monitoring (CSM) follows relevant or unclear effects of a particular trait, as identified during risk assessment, general surveillance (GS) covers entirely unforeseen effects or those that are cross-functional and difficult to predict (indirect, delayed, or combinatory).