Main frame of the Provenance simulator. In the main frame of the simulator, called Provenance, a user can enter information to store data provenance for each execution of a particular bioinformatics workflow. In the upper left frame, general information of the execution (description and execution date) can be seen. Besides, elements Agent, Entity and Activity are listed, together with the three types of relations and the annotations called Attachments. With the objective of making it user friendly, Collections were implemented as Entities with "Size" property greater than 1. Finally, a relation WasDerivedFrom is found on the lower right frame, since it cannot be modified by users. Its creation or removal is originated from the creation/deletion of the relations Used and WasGeneratedBy.