Although still essential to most learning settings, even the most comprehensive, visually-appealing text is capable of operating in only a single learning dimension. That is, it can only display information. The 2nd Dimension During the last decade, we have seen the rise of educational software. Good instructional software not only displays information, but also provides opportunities for the user to interact with the information and receive feedback. The user is given greater control over his or her learning.
Computer software adds a second dimension to the learning resources.
In the last few years CD-ROM and Laser Disks have increased the scope and depth of information available to most students. Digital media also enhance the learning experience by incorporating multi-sensory resources, and by providing index and search mechanisms. These third-dimension media expand upon the primary dimension of the textbook as well as the secondary dimension of software. The Web seemed almost subversive. Never before had end users had the power to create their own resources.