This volume contains papers from the main track and associated workshops of the 15th ITAT conference. The conference was held in Hotel C ingov, Slovensky Raj, Slovakia on September 17-21, 2015. ITAT is a computer science conference with the primary goal of presenting new results of young researchers and doctoral students from Slovakia and the Czech Republic. The conference serves as a platform for exchange of information within the community, and also provides opportunities for informal meetings of the participants in a mountainous regions of the Czech Republic and Slovakia. The traditional...