DIR stands for "Doing it Right"
and is a phrase mostly contected to GUE standards of diving.
It is an approch to diving that pushes team diving (dive planning) Bouncany control and stream lined equipment config.
You can read more about it at
www.gue.com or
www.scubadivernet.comor email me and i'll give you more info.
this is a very very very breif explantion.
thank for the question.