This book constitutes the refereed proceedings of the 28th Conference on Current Trends in Theory and Practice of Informatics, SOFSEM 2001, held in Piestany, Slovak Republic, in November/December 2001. Teh volume presents 12 invited lectures and one keynote paper by leading researchers together with 18 revised full research papers selected from 46 submissions. The papers span the whole range of informatics with emphasis on trends in informatics, enabling technologies for global computing, and practical systems engineering.