Kris,

I *think* Atkins changed in 1992 and again in 2002 and then again more recently. here is a link to a recent thread on Atkins '72. I can't tell you all the differences for a comparison but some of the diffs are:

A72: no net carbs
A72: more strict induction (as close to zero as possible for one week) and more "limited" choice of foods for the first week.
A72: different "ladder" - add 5-8 carbs per week.


I'm sure there are other differences but, because I'm at work and do not have the books handy, I can't list the other differences.