Generally rely on written communications. Although it is possible to include audio and video in computer-based distance learning, most of the communications are in the form of text. Require substantial planning . E-mail and other asynchronous computer technologies require a great deal of planning and preparation on the part of the instructor. No guaranteed performance.
Computer networks are notoriously unreliable.
If students wait until the last minute to check their e-mail messages or search the Web, there is always the risk the server may be down or the Web sites may have moved. Guidelines for Incorporating Computer Technologies Provide adequate structure and guidelines. The most successful asynchronous projects include deadlines and a structure. Provide timely feedback to participants. Get to know the students.