the purpose of the I2I forum is to give an area for dive professionals to chat about the ins and outs of their profession without being embarrassed by the student/client bumping into their conversation. It is "shop talk" and we discuss different TEACHING techniques as opposed to DIVING techniques which are discussed out here in the open forum. If you do a search for any of the items you brought up you are going to find many hours worth of reading and research that have already taken place.