This book constitutes the refereed proceedings of the Third International Conference on Informatics in Secondary Schools - Evolution and Perspectives, ISSEP 2008, held in Torun, Poland in July 2008. The 28 revised full papers presented together with 4 invited papers were carefully reviewed and selected from 63 submissions. A broad variety of topics related to teaching informatics in secondary schools is addressed ranging from national experience reports to paedagogical and methodological issues. The papers are organized in topical sections on informatics, a challenging topic, didactical merits of robot-based instruction, transfer of knowledge and concept formation, working with objects and programming, strategies for writing textbooks and teacher education, national and international perspectives on ICT education, as well as e-learning.