Greg:
Thanks for this. However, I noticed you enrolled in our bulletin
board, can you repost this there? See my earlier posting for the URL.

I would prefer all new postings be made there.
Thanks,
Alan Shalloway

--- In dpexplained@yahoogroups.com, "Frank, Gregery (OTS-EDH)"
<gregery_frank@b...> wrote:
> Hello All,
>
> I have just bought the following book:-
>
> http://www.amazon.com/exec/obidos/tg/detail/-
/0201703696/qid=1044058150/sr=1
> -3/ref=sr_1_3/104-2604210-0929567?v=glance
> <http://www.amazon.com/exec/obidos/tg/detail/-
/0201703696/qid=1044058150/sr=
> 1-3/ref=sr_1_3/104-2604210-0929567?v=glance&s=books> &s=books
>
> I usually don't buy collections of papers but this is an
exception. Parnas
> is the originator of the concept of "information hiding" - way
back in 1972.
> BTW, information hiding as he originally defined it was way more
than just
> data encapsulation. He talks about designing the concept to be
> hidden/variable - can include "decisions" - not just data.
>
> It contains a lot of material (somewhat dated) about the ideas
that later
> became object-orientation. Not the least of which is mentioned in
GoF in
> chap 1 as "Consider what should be variable in your design."
>
> It's interesting to see that, while the names have changed, some
of these
> ideas have been around a long time. It deepened my understanding
of what an
> object can actually be.
>
> If you can find a second-hand copy for half price ($20) and have a
sense of
> intellectual curiousity, you might be interested.
>
> Greg Frank
> "Change is inevitable. Survival is not." - Charles Darwin
>
>
>
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