For the first reason it must be associated with an educational content and aim to teach. The second select the media that contains formal content. It is n attractive and modern media that be useful most learning. The third a medium fits age level knowledge and experience of participants.
4. the media should be very easy to use help, not too complex, cumbersome.
5. the media production techniques, quality good There is clearly true.
6. are affordable too, or if it should be worth the time and investment.