A distributed clinical trial system that provides configurability, reusability and integration of randomization and inventory configurations for different clinical trials with various electronic data capture (EDC) systems. The distributed clinical trial system includes a method of randomizing subjects in a multi-arm clinical trial. In accordance with a method, a subject identifier and a trial identifier are received from an EDC system. The trial identifier indicates the multi-arm clinical trial and the subject identifier indicates a subject enrolled in the multi-arm clinical trial. A randomization design previously configured for the multi-arm clinical trial is retrieved from a database based on the received trial identifier. The subject identifier is assigned to an arm identifier of the multi-arm clinical trial based on the randomization design. The arm identifier indicates an arm of the multi-arm clinical trial to which the subject has been assigned.