This conference is the nineth in a series. The organizers aimed to bring together PhD students working on any field of computer science and its applications to help them publishing one of their first abstracts and papers, and provide an opportunity to hold a scientific talk. As far as we know, this is one of the few such conferences. The aims of the scientific meeting were determined on the council meeting of the Hungarian PhD Schools in Informatics: it should • provide a forum for PhD students in computer science to discuss their ideas and research results; • give a possibility to have constructive criticism before they present the results at profes-sional conferences; • promote the publication of their results in the form of fully referee...