Why should you take instructional media into consideration?

The use of different media provides, for example information in a meaningful context and makes the learning environment more a varied. Oral and written communication are the two most common forms of transmitting knowledge in educational settings. However, learning with only these forms of communication limits how students see the world. Curricula should adopt additional media, such as video, computer, photographs, and sound, to provide richer experiences.
On the other hand, the teacher should take into consideration that the development of useful instructional visual and audio media is very time-consuming and costs a lot of money. So, the benefit should be clear. Therefore an overview should be made which media are used with their special benefit, included with the available time and money needed.

Especially instructional media is used for explanations with the purpose of e.g., introduction, feedback (on assignments), or for supporting a simulation. A special purpose for the use of sound could be to decrease the amount of text for learners with for instance low motivation or a reading disorder.