Dear list, In addition to single datasets tool file inputs allow to choose between - multiple dataset - dataset collection - some tools use repeat tags for multiple inputs I would like to know what the intended behavior of galaxy is for the three options considering multiple datasets? Is this described somewhere? Is it that the tool is applied to each of the multiple inputs separately or at once. For some tools one case makes more sense than the other. Best, Matthias -- ------------------------------------------- Matthias Bernt Bioinformatics Service Molekulare Systembiologie (MOLSYB) Helmholtz-Zentrum für Umweltforschung GmbH - UFZ/ Helmholtz Centre for Environmental Research GmbH - UFZ Permoserstraße 15, 04318 Leipzig, Germany Phone +49 341 235 482296, m.bernt@ufz.de, www.ufz.de Sitz der Gesellschaft/Registered Office: Leipzig Registergericht/Registration Office: Amtsgericht Leipzig Handelsregister Nr./Trade Register Nr.: B 4703 Vorsitzender des Aufsichtsrats/Chairman of the Supervisory Board: MinDirig Wilfried Kraus Wissenschaftlicher Geschäftsführer/Scientific Managing Director: Prof. Dr. Dr. h.c. Georg Teutsch Administrative Geschäftsführerin/ Administrative Managing Director: Prof. Dr. Heike Graßmann -------------------------------------------