The Young Experimentalists and Theorists Institute aims to promote interaction between the two halves of the particle physics community at the early career stage and encourage interest in phenomenology. YETI aims to give a pedagogical introduction to a particular area of topical interest in particle physics. A key feature are the hands-on sessions in the afternoons. The topic of YETI 2015 is cosmology and astroparticle physics. The specific topics and lecture schedule can be found in the timetable link.