The D-Plane is very confusing to me as I am not mathmatical at all in nature. On Kev's facebook page the following link was put up that I really felt helped and made a lot of sense to me.
*apologies if this has already been posted as I am joining the conversation late in the day
__________________ The student senses his teacher’s steadfast belief and quiet resolve: “This is doable. It is doable by you. The pathway is there. All you need is determination and time.” And together, they make it happen.