We describe the organizational setup and the set of rules developed to test earthquake likelihood models of the Regional Earthquake Likelihood Models (RELM) initiative. Truly prospective testing for a multitude of forecasts in an unbiased and reproducible way requires a set of rules to be obeyed by each model as well as a cyber-infrastructure: the testing center. These rules encompass free parameters, e.g., the testing area and grid, forecast periods, magnitude ranges, earthquake catalogs provided to the models and used for testing, and declustering. A combination of these free parameters defines a class of models. Within RELM we distinguish between...

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