It's in the book "Semantic Information Processing" that Marvin Minsky put 
together in the mid 60s. I will get it scanned and send around (it is paired 
with the even more class "Advice Taker" paper that led to Lisp ...

Cheers,

Alan




>________________________________
> From: Wesley Smith <wesley.h...@gmail.com>
>To: Alan Kay <alan.n...@yahoo.com>; Fundamentals of New Computing 
><fonc@vpri.org> 
>Sent: Thursday, March 15, 2012 10:13 AM
>Subject: Re: [fonc] [IAEP] Barbarians at the gate! (Project Nell)
> 
>On Thu, Mar 15, 2012 at 5:23 AM, Alan Kay <alan.n...@yahoo.com> wrote:
>> You don't want to use assert because it doesn't get undone during
>> backtracking. Look at the Alex Warth et al "Worlds" paper on the Viewpoints
>> site to see a better way to do this. (This is an outgrowth of the "labeled
>> situations" idea of McCarthy in 1963.)
>
>I found a reference to this paper in
>http://arxiv.org/pdf/1201.2430.pdf .  Looks like it's a paper called
>"Situations, actions and causal laws".  I'm not able to find any
>PDF/online version.  Anyone know how to get ahold of this document?
>
>thanks,
>wes
>
>
>
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