This enables the instructor to adapt and respond to questions without delay. All archived and stored material belongs in this category, including media such as CD-ROM, web pages, email, fax, videotape, and so forth. If the teaching session is recorded and archived then students can go back and review the lesson. Considerations When designing a distance education course the instructional designer should take into consideration both types of delivery. Selection of delivery systems depends upon the needs of the students and the type of subject matter.
Some instruction can be entirely of one delivery type or another.
But this is rare. Both have their advantages and, conversely, their disadvantages are addressed by the opposite delivery system. A combination of the two provides an interactive learning environment. Here are some examples of institutions that use a combination of both delivery methods. OnLine Education, University of Paisley, Scotland.