Production of audiotapes can be used in place of the telephone and serve to eliminate the need to listen real-time. Combining audiotapes with slides is another delivery method which utilizes both audio and visual tools. Sound and video cards are optional but preferred. The web can transmit images, audio and video. It can be highly interactive, enabling students and instructors to communicate with one another.
Users can participate in self-paced programs that incorporate text, graphics, audio and video.
Sound and video cards may also be required. Disadvantages include cost of production and lack of ability to interact with other participants and the instructor. Live video courses require specific equipment for transmitting, receiving and displaying content and for allowing participant interaction. Disadvantages for live video include the need for access to a designated delivery site. Preproduced videotapes can be used to present content to individuals and groups at the time and location of their choice.