Auditing comes in two main varieties. One is asking the person what is or has been, the other is telling the person what is or has been.
The 2nd (sometimes called "Implantology"), ideally, should result in the person being told the intimate contents of his/her own mind and/or space, and being also delighted, preferably with a floating Tone Arm on the e-meter.
http://forum.exscn.net/showpost.php?p=77478&postcount=14
The justification for the "Implantology" levels of Scientlogy was that they removed the "final barrier to full OT." In the enthusiastic hope that this was IT, people opened their minds to these levels.
These levels have had 40 years to produce "full OTs" and have not.
That these levels appeared at the time that L. Ron Hubbard began implementing the basics of the booklet that he called the 'Brainwashing Manual' on his own followers is, IMO, something to consider.
http://warrior.xenu.ca/Brainwashing-front.jpg
It's also noteworthy, IMO, that at the time when Scientology's founder started to become - drastically - less sane, these levels popped out of his mind and were fed - with great fanfare - into the minds of Scientologists.
http://www.xenutv.com/int/shrinkingworld.htm
I still think the first variety of auditing has some validity; am not much interested in the second.