Dear Colleagues, We are conducting a user study to compare different types of hybrid graph visualizations. If you have a bit of time, please help us by participating to the study! This will take you about 25-30 minutes, including a short tutorial and a short training. Since you will be asked to execute visual tasks, you should avoid using a small screen (mobile phone or small tablet). Please, visit the survey here: http://mozart.diei.unipg.it/limesurvey/index.php/963874?lang=en <http://mozart.diei.unipg.it/limesurvey/index.php/963874?lang=en> Comments are also very welcome! (You can provide feedback in the last question of the study.) Thank you in advance for your consideration and your valuable help. Emilio Di Giacomo Walter Didimo Beppe Liotta Fabrizio Montecchiani Alessandra Tappini