Hi Creighton:
For me, selection of media is simply choosing the best methods I can use to get my message, lesson, or infromation conveyed to my students.
There are a gazillion ways to deliver information; my challenge is to find which ones will be the most efficient, instructive, helpful, and useful given the resources I have available to me. I try to add as much variety as possible, and use only short sessions of any one type of media.
Regards, Barry