[ih] Hourglass model question

[Steve Crocker]

Layering was part of the earliest discussions we had in 1968-69.

On Fri, Jul 5, 2019 at 5:34 PM Craig Partridge <craig at tereschau.net> wrote:

> Related but not quite on target.
>
> The hourglass/margarita glass is a representation of layering.  And back
> in 1988 I tried to figure out the origins of the layered model for a
> collection of networking papers I edited.  At the time, the best answer I
> found was that layering, from a networking perspective, originated with a
> paper by Davidson et al. on the ARPANET TELNET protocol from the DATACOM
> conference in 1977.  It portrays layering as a fan, in which different
> protocols layer on each other as needed.  But it clearly articulates the
> notion of layering and how layers interact.  (And there's a narrow window
> between the 1977 paper and the Cerf/Kahn 1974 paper on TCP/IP, which
> presumably would have mentioned layering if the concept was in wide use).
>
> Craig
>
> On Wed, Jul 3, 2019 at 8:10 AM Andrew Russell <arussell at arussell.org>
> wrote:
>
>> Hi everyone -
>>
>> You might have seen the CACM featured an article in the most recent issue
>> “On the Hourglass Model” -
>> https://cacm.acm.org/magazines/2019/7/237714-on-the-hourglass-model/fulltext
>> .
>>
>> It’s not a history paper, but it raised a history-related question for
>> me.  As far as I know the visual representation in question started with a
>> drawing of a margarita glass in 1979, in the context of an OSI committee
>> meeting and the 7-layer model. I reproduced the image on page 214 of my
>> book “Open Standards and the Digital Age” - it’s visible to me here:
>> https://books.google.com/books?id=jqroAgAAQBAJ&pg=PA214&lpg=PA214.
>>
>> My question for the list has 2 parts:
>> 1) when/where did the margarita glass turn into an hourglass?
>> 2) when/where did the TCP/IP community borrow it from the OSI community?
>>  (I’m assuming this is how it happened, would be very interested in
>> evidence or recollections to the contrary)
>>
>> My hunch, without doing a fresh round of research, is that I should look
>> first to papers by David Clark and co-authors in the 1980s to answer a
>> third question, which is how this illustrated concept morphed into a
>> “Theorem” (as the CACM essay puts it).  But that’s just a hunch, and I’d
>> really appreciate pointers or recollections.
>>
>> Thank you!
>>
>> Andy
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>
>
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