New WWW technologies allow for integrating distance education power of WWW with interactivity and intelligence. Integrating on-line presentation of learning materials with the interactivity of problem solving environments and the intelligence of intelligent tutoring systems results in a new quality of learning materials that we call I3-textbooks. In this paper, we describe the development of ELM-ART, an I3-textbook for learning programming that can be accessed via Internet and that is based on the on-site learning environment ELM-PE.