>> Usable redundancy ... Simplicity

no arguments here.
>
>> ... what I would like you to do is to point out for me the flaws in
>>the above system.

I'll nudge Hog's 'only way' tag, NOT the system itself which I approve
of. This is all Ive intended to do in this thread.

Again, NONE of the below questions Hog rigging, merely the idea that
standards are the *only* way.

standards
---------

>> Standards means that you know instinctively where your buddy's
equipment is ...

1st vs 3rd Perspective:
you view your dive kit from a first person perspective. You view buddies
from a 3rd person perspective. Well learned procedures with your kit
_can_ become *motor* reactions. Dealing with a buddy's kit, unless you
do it often, remains a *cognitive* reaction. The two are seperate.
Inflating your buddy's BCD is *not* the same mental process as inflating
your own or locating it in water especially at unusual relative
orientations. Many Hogers believe it is.

'I know where it is' Case history: NASA astronauts (could you be better
prepared for a situation?) left pliers hanging in space while they used
their hands. If the pliers didnt drift they almost always put their hand
straight back on them. If the pliers drifted or turned they almost
always missed them, often unable to even see them as they were looking
for a 'differently oriented plier'.

Other points I'd like disproven before I plump unquestioningly for Hog:

1. most people expecting to find something in a standard situation will
assume its lost if its actually somewhere else. Lost. Not flapping
nearby. Problem goes away when you dont assume a standard.

2. situational versus state dependent learning, eg Helicoptor sinking
drills and fire escape training can be honed to perfection but still go
out the window when the flames and smoke billow. Knowing stuff helps,
trying stuff helps more.


>> How is a single with a pony better than a manifolded, isolated
>>doubles? Can you do a failure analysis of your rig and come out better
>>than a hogarth setup?

Probably not, except a manifolded twin loses all gas if the isolator
valve leaks - unlikely but mine wont. I cant clearly say mine's better
than either Hog option, and vice versa.

Phil
--
  Phil Clarke
  Human Factors, BT Labs
  http://www.labs.bt.com/people/clarkep3/
>
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