But there is the constant problem of dangling references. For the on-line material to compete with paper, authors need to prepare resources that complement. For instance, animation may provide insights not available from text alone. Or, the student can be encouraged to experiment with an interactive system to gain new insights. Questions with feedback can check for understanding and provide feedback.
Distance learning has a long history and has used many of the earlier non-computing technologies.
Much of the adoption of these newer forms in distance education has been augmenting what were often poor analogies of textbooks with visualisation. The technologies This project depends on several underlying technologies. This initially meant the non-linear reading of text in a computer system, but now includes other media types. Tim Berners-Lee initiated the World Wide Web in 1991. Since the start of personal computers in the early 1970s, their performance has continued with an almost geometric improvement in most features.