Karl_in_Calif once bubbled...
I believe that JJ----(EDITORS NOTE:...ALONG WITH MEMBERS OF MOST TECHNICAL TRAINING AGENCIES)----is completely correct about divers needing to be totally self reliant. Unfortunately many of the major training agencies purposely train students to a level of buddy dependence. So this probably will not change much in the future.
I believe JJ is totally right that a team of divers involved in a high risk operation should all be equally configured.
(EDITORS NOTE: HERE JJ MIRRORS OTHER AUTHORITIES IN THE FIELD WHO BELIEVE THAT WHEN TEAMS ARE CONFIGURED AS MUCH AS POSSIBLE TO BE ALIKE, IT SMOOTHS THE LOGISTICS OF THE EFFORT.)
I believe that JJ is totally right about physical fitness activities during the week, to stay in prime shape for diving.
I believe JJ is totally right about using nitrox for all dives rather than air.
(EDITORS NOTE:...OR BREATHING GASES OTHER THAN AIR, SUCH AS HELI-OX, AS USED, FOR INSTANCE IN CCR's)
I believe that JJ is totally right that your SPG should be unencumbered by a console of any kind.
I believe that JJ is totally right about smaller fins, such as ScubaPro jetfins or Turtle fins, and low displacement masks.
(EDITORS NOTE: LOW DISPLACEMENT MASKS ARE NOT POSSIBLE WHEN USING COMM GEAR)
Much of these DIR concepts have been around longer than JJ, however he has articulated them well in his book.
(EDITORS NOTE:---AS WE KNOW, HOWEVER, THE BOOK SHOULD BE TITLED: "A COLLECTION OF THE PRACTICES AND PROCEDURES OF THE ELDERS OF WKPP DIVING, AS RE-INTERPRETED BY JARROD JABLONSKI, THE YOUNGER"---PLEASE SEE EARLIER POST BY WILLIAM HOGARTH MAIN)
JJ's concept of full uniformity for non-high risk operations does not make sense to me, however. I agree that there are advantages to being uniformly configured all the time. But there are also advantages to flexibility as well. So this is a pros vs cons issue.
By analogy, since you do not always configure yourself the same way as for ice diving for other diving as well, then the concept of uniform configuration is not universally applicable and hence not ideal. I simply prefer more flexibility and customization than JJ prefers.
And thats why I prefer "partially DIR."
Good post, Karl!