Difference between revisions of "RFC1121"

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Network Working Group                                    J. Postel (ISI)
 
Network Working Group                                    J. Postel (ISI)
 
Request for Comments:  1121                          L. Kleinrock (UCLA)
 
Request for Comments:  1121                          L. Kleinrock (UCLA)
                                                        V. Cerf (NRI)
+
                                                          V. Cerf (NRI)
                                                      B. Boehm (UCLA)
+
                                                        B. Boehm (UCLA)
                                                      September 1989
+
                                                          September 1989
  
  
                      Act One - The Poems
+
                          Act One - The Poems
  
  
 
Status of this Memo
 
Status of this Memo
  
This RFC presents a collection of poems that were presented at "Act
+
  This RFC presents a collection of poems that were presented at "Act
One", a symposium held partially in celebration of the 20th
+
  One", a symposium held partially in celebration of the 20th
anniversary of the ARPANET.  Distribution of this memo is unlimited.
+
  anniversary of the ARPANET.  Distribution of this memo is unlimited.
  
 
Introduction
 
Introduction
  
The Computer Science Department of the University of California, Los
+
  The Computer Science Department of the University of California, Los
Angeles (UCLA) organized a Symposium on Very High Speed Information
+
  Angeles (UCLA) organized a Symposium on Very High Speed Information
Networks as the first in a projected series of meetings on Advanced
+
  Networks as the first in a projected series of meetings on Advanced
Computer Technologies, thus ACT ONE.  The time was chosen to also
+
  Computer Technologies, thus ACT ONE.  The time was chosen to also
commemorate the 20th anniversary of the installation of the first
+
  commemorate the 20th anniversary of the installation of the first
Interface Message Processor (IMP) on the ARPANET which took place at
+
  Interface Message Processor (IMP) on the ARPANET which took place at
UCLA.
+
  UCLA.
  
The Symposium took on a theatrical theme and a few of the speakers
+
  The Symposium took on a theatrical theme and a few of the speakers
could not resist the temptation to commit poetry.  This memo is an
+
  could not resist the temptation to commit poetry.  This memo is an
attempt to capture the result.
+
  attempt to capture the result.
  
 
The Poems
 
The Poems
  
  
                              WELCOME
+
                                  WELCOME
                                by
+
                                    by
                          Leonard Kleinrock
+
                            Leonard Kleinrock
  
We've gathered here for two days to examine and debate
+
  We've gathered here for two days to examine and debate
And reflect on data networks and as well to celebrate.
+
  And reflect on data networks and as well to celebrate.
To recognize the leaders and recount the path we took.
+
  To recognize the leaders and recount the path we took.
We'll begin with how it happened; for it's time to take a look.
+
  We'll begin with how it happened; for it's time to take a look.
  
Yes, the history is legend and the pioneers are here.
+
  Yes, the history is legend and the pioneers are here.
Listen to the story - it's our job to make it clear.
+
  Listen to the story - it's our job to make it clear.
We'll tell you where we are now and where we'll likely go.
+
  We'll tell you where we are now and where we'll likely go.
So welcome to ACT ONE, folks.  Sit back - enjoy the show!!
+
  So welcome to ACT ONE, folks.  Sit back - enjoy the show!!
  
  
Line 56: Line 56:
  
  
 +
Postel & Kleinrock & Cerf & Boehm                              [Page 1]
  
 +
RFC 1121                  Act One - The Poems            September 1989
  
                          ODE TO A QUEUE
 
                                by
 
                          Leonard Kleinrock
 
  
                In the 20 years of funding
+
                              ODE TO A QUEUE
                Many fields has DARPA led.
+
                                    by
                But the finest thing that they did bring
+
                            Leonard Kleinrock
                Was the analytic thread.
 
  
                By that I mean they nurtured
+
                  In the 20 years of funding
                Quantitative research tools.
+
                  Many fields has DARPA led.
                And they always felt for all their gelt
+
                  But the finest thing that they did bring
                They got principles and rules.
+
                  Was the analytic thread.
  
                Indeed a wealth of knowledge
+
                  By that I mean they nurtured
                Was uncovered and was new.
+
                  Quantitative research tools.
                And the common thread with which we led
+
                  And they always felt for all their gelt
                Was the analytic queue!
+
                  They got principles and rules.
  
                Now a queue may have one server.
+
                  Indeed a wealth of knowledge
                If there's more, they form a team.
+
                  Was uncovered and was new.
                Its dearest wish is just to fish
+
                  And the common thread with which we led
                In a quiet Poisson stream.
+
                  Was the analytic queue!
  
                If you want to model networks
+
                  Now a queue may have one server.
                Or a complex data flow
+
                  If there's more, they form a team.
                A queue's the key to help you see
+
                  Its dearest wish is just to fish
                All the things you need to know.
+
                  In a quiet Poisson stream.
  
                So the next time you feel lonely
+
                  If you want to model networks
                And wonder what to do,
+
                  Or a complex data flow
                You'll soon feel fine if you join the line
+
                  A queue's the key to help you see
                Of an analytic queue!
+
                  All the things you need to know.
  
 +
                  So the next time you feel lonely
 +
                  And wonder what to do,
 +
                  You'll soon feel fine if you join the line
 +
                  Of an analytic queue!
  
                        THE PAST IS PROLOGUE
 
                                by
 
                          Leonard Kleinrock
 
  
                The past is prologue so they say.
+
                          THE PAST IS PROLOGUE
                So Scene 1 was played today.
+
                                    by
                It set the stage to point the way
+
                            Leonard Kleinrock
                To high speed nets on Friday.
 
  
                And old slow IMP, a costly link,
+
                  The past is prologue so they say.
                Codes to fix the lines that stink,
+
                  So Scene 1 was played today.
                Ideas born in tanks that think,
+
                  It set the stage to point the way
                Tomorrow's distance sure to shrink.
+
                  To high speed nets on Friday.
  
 +
                  And old slow IMP, a costly link,
 +
                  Codes to fix the lines that stink,
 +
                  Ideas born in tanks that think,
 +
                  Tomorrow's distance sure to shrink.
  
  
  
 +
Postel & Kleinrock & Cerf & Boehm                              [Page 2]
  
                But first tonight we'll drink and eat.
+
RFC 1121                  Act One - The Poems            September 1989
                We'll take some time good friends to greet.
 
                Hear Bible class from Danny's seat.
 
                Those good old days were bittersweet!
 
  
  
                            THE BIG BANG!
+
                  But first tonight we'll drink and eat.
                    (or the birth of the ARPANET)
+
                  We'll take some time good friends to greet.
                                by
+
                  Hear Bible class from Danny's seat.
                          Leonard Kleinrock
+
                  Those good old days were bittersweet!
  
It was back in '67 that the clan agreed to meet.
 
The gangsters and the planners were a breed damned hard to beat.
 
The goal we set was honest and the need was clear to all:
 
Connect those big old mainframes and the minis, lest they fall.
 
  
The spec was set quite rigid:  it must work without a hitch.
+
                              THE BIG BANG!
It should stand a single failure with an unattended switch.
+
                      (or the birth of the ARPANET)
Files at hefty throughput 'cross the ARPANET must zip.
+
                                    by
Send the interactive traffic on a quarter second trip.
+
                            Leonard Kleinrock
  
The spec went out to bidders and t'was BBN that won.
+
  It was back in '67 that the clan agreed to meet.
They worked on soft and hardware and they all got paid for fun.
+
  The gangsters and the planners were a breed damned hard to beat.
We decided that the first node would be we who are your hosts
+
  The goal we set was honest and the need was clear to all:
And so today you're gathered here while UCLA boasts.
+
  Connect those big old mainframes and the minis, lest they fall.
  
I suspect you might be asking "What means FIRST node on the net?"
+
  The spec was set quite rigid:  it must work without a hitch.
Well frankly, it meant trouble, 'specially since no specs were set.
+
  It should stand a single failure with an unattended switch.
For you see the interface between the nascent IMP and HOST
+
  Files at hefty throughput 'cross the ARPANET must zip.
Was a confidential secret from us folks on the West coast.
+
  Send the interactive traffic on a quarter second trip.
  
BBN had promised that the IMP was running late.
+
  The spec went out to bidders and t'was BBN that won.
We welcomed any slippage in the deadly scheduled date.
+
  They worked on soft and hardware and they all got paid for fun.
But one day after Labor Day, it was plopped down at our gate!
+
  We decided that the first node would be we who are your hosts
Those dirty rotten scoundrels sent the damned thing out air freight!
+
  And so today you're gathered here while UCLA boasts.
  
As I recall that Tuesday, it makes me want to cry.
+
  I suspect you might be asking "What means FIRST node on the net?"
Everybody's brother came to blame the other guy!
+
  Well frankly, it meant trouble, 'specially since no specs were set.
Folks were there from ARPA, GTE and Honeywell.
+
  For you see the interface between the nascent IMP and HOST
UCLA and ATT and all were scared as hell.
+
  Was a confidential secret from us folks on the West coast.
  
We cautiously connected and the bits began to flow.
+
  BBN had promised that the IMP was running late.
The pieces really functioned - just why I still don't know.
+
  We welcomed any slippage in the deadly scheduled date.
Messages were moving pretty well by Wednesday morn.
+
  But one day after Labor Day, it was plopped down at our gate!
All the rest is history - packet switching had been born!
+
  Those dirty rotten scoundrels sent the damned thing out air freight!
  
 +
  As I recall that Tuesday, it makes me want to cry.
 +
  Everybody's brother came to blame the other guy!
 +
  Folks were there from ARPA, GTE and Honeywell.
 +
  UCLA and ATT and all were scared as hell.
  
 +
  We cautiously connected and the bits began to flow.
 +
  The pieces really functioned - just why I still don't know.
 +
  Messages were moving pretty well by Wednesday morn.
 +
  All the rest is history - packet switching had been born!
  
  
Line 164: Line 168:
  
  
                      ROSENCRANTZ AND ETHERNET
+
Postel & Kleinrock & Cerf & Boehm                               [Page 3]
                                by
 
                               Vint Cerf
 
  
All the world's a net!  And all the data in it merely packets
+
RFC 1121                  Act One - The Poems            September 1989
come to store-and-forward in the queues a while and then are
 
heard no more.  'Tis a network waiting to be switched!
 
  
To switch or not to switch?  That is the question.  Whether
 
'tis wiser in the net to suffer the store and forward of
 
stochastic networks or to raise up circuits against a sea
 
of packets and, by dedication, serve them.
 
  
To net, to switch.  To switch, perchance to slip!
+
                        ROSENCRANTZ AND ETHERNET
Aye, there's the rub.  For in that choice of switch,
+
                                    by
what loops may lurk, when we have shuffled through
+
                                Vint Cerf
this Banyan net?  Puzzles the will, initiates symposia,
 
stirs endless debate and gives rise to uncontrolled
 
flights of poetry beyond recompense!
 
  
 +
  All the world's a net!  And all the data in it merely packets
 +
  come to store-and-forward in the queues a while and then are
 +
  heard no more.  'Tis a network waiting to be switched!
  
                              UNTITLED
+
  To switch or not to switch?  That is the question.  Whether
                                by
+
  'tis wiser in the net to suffer the store and forward of
                            Barry Boehm
+
  stochastic networks or to raise up circuits against a sea
 +
  of packets and, by dedication, serve them.
  
                Paul Baran came out of the wood
+
  To net, to switch.  To switch, perchance to slip!
                With a message first misunderstood
+
  Aye, there's the rub.  For in that choice of switch,
                  But despite dangers lurking
+
  what loops may lurk, when we have shuffled through
                  The IMP's were soon working
+
  this Banyan net?  Puzzles the will, initiates symposia,
                And ARPA did see it was good.
+
  stirs endless debate and gives rise to uncontrolled
 +
  flights of poetry beyond recompense!
  
                So in place of our early myopia
 
                We now have a net cornucopia
 
                  With IMP's, TIP's, and LAN's
 
                  Wideband VAN's, MAN's, and WAN's
 
                And prospects of World Net Utopia.
 
  
                But though we must wind up the clock
+
                                UNTITLED
                With thoughts of downstream feature shock
+
                                    by
                  We all be can mollified
+
                                Barry Boehm
                  For there's no one more qualified
 
                To discuss this than Leonard Kleinrock.
 
  
 +
                  Paul Baran came out of the wood
 +
                  With a message first misunderstood
 +
                      But despite dangers lurking
 +
                      The IMP's were soon working
 +
                  And ARPA did see it was good.
  
 +
                  So in place of our early myopia
 +
                  We now have a net cornucopia
 +
                      With IMP's, TIP's, and LAN's
 +
                      Wideband VAN's, MAN's, and WAN's
 +
                  And prospects of World Net Utopia.
  
 +
                  But though we must wind up the clock
 +
                  With thoughts of downstream feature shock
 +
                      We all be can mollified
 +
                      For there's no one more qualified
 +
                  To discuss this than Leonard Kleinrock.
  
  
Line 215: Line 221:
  
  
 +
 +
 +
 +
Postel & Kleinrock & Cerf & Boehm                              [Page 4]
 +
 +
RFC 1121                  Act One - The Poems            September 1989
  
  
 
Notes
 
Notes
  
The Symposium was held August 17 & 18, 1989, a Thursday and Friday.
+
  The Symposium was held August 17 & 18, 1989, a Thursday and Friday.
  
"Welcome" was presented on Thursday morning during the Overture.
+
  "Welcome" was presented on Thursday morning during the Overture.
  
"Ode to a Queue" was presented in the Thursday morning session on
+
  "Ode to a Queue" was presented in the Thursday morning session on
"Giant Steps Forward: Technology Payoffs".
+
  "Giant Steps Forward: Technology Payoffs".
  
"The Past is Prologue" was presented at the end of the Thursday
+
  "The Past is Prologue" was presented at the end of the Thursday
afternoon sessions.
+
  afternoon sessions.
  
"The Big Bang!" was presented during the after dinner events on
+
  "The Big Bang!" was presented during the after dinner events on
Thursday night.
+
  Thursday night.
  
"Rosencrantz and Ethernet" was presented at the morning session on
+
  "Rosencrantz and Ethernet" was presented at the morning session on
Friday on "Communication Technologies in the next Millenium" (note
+
  Friday on "Communication Technologies in the next Millenium" (note
that this version may differ slightly from the actual presentation
+
  that this version may differ slightly from the actual presentation
since it was reconstructed from human memory several weeks later).
+
  since it was reconstructed from human memory several weeks later).
  
The untitled poem by Barry Boehm was presented in the Friday
+
  The untitled poem by Barry Boehm was presented in the Friday
afternoon session on "Impact on Government, Commerce and Citizenry".
+
  afternoon session on "Impact on Government, Commerce and Citizenry".
Barry gave his talk on "The Software Challenge to Our Technical
+
  Barry gave his talk on "The Software Challenge to Our Technical
Aspirations" then introduced the next speaker with this poem.
+
  Aspirations" then introduced the next speaker with this poem.
  
 
Security Considerations
 
Security Considerations
  
None.
+
  None.
  
 
Authors' Addresses
 
Authors' Addresses
  
Jon Postel
+
  Jon Postel
USC/Information Sciences Institute
+
  USC/Information Sciences Institute
4676 Admiralty Way
+
  4676 Admiralty Way
Marina del Rey,  CA  90292-6695
+
  Marina del Rey,  CA  90292-6695
 +
 
 +
  Phone: 213-822-1511
 +
 
 +
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
Postel & Kleinrock & Cerf & Boehm                              [Page 5]
 +
 
 +
RFC 1121                  Act One - The Poems            September 1989
 +
 
 +
 
 +
  Leonard Kleinrock
 +
  University of California
 +
  Computer Science Department
 +
  3732G Boelter Hall
 +
  Los Angeles, CA 90024-1600
 +
 
 +
  Phone: 213-825-2543
 +
 
 +
 +
 
 +
 
 +
  Vinton G. Cerf
 +
  Corporation for National Research Initiatives
 +
  1895 Preston White Drive, Suite 100
 +
  Reston, VA 22091
 +
 
 +
  Phone: 703-620-8990
  
Phone: 213-822-1511
+
  
 
  
 +
  Barry Boehm
 +
  University of California
 +
  Computer Science Department
 +
  3732 Boelter Hall
 +
  Los Angeles, CA 90024-1600
  
 +
  Phone: 213-825-8137
  
 +
  
  
Line 270: Line 326:
  
  
Leonard Kleinrock
 
University of California
 
Computer Science Department
 
3732G Boelter Hall
 
Los Angeles, CA 90024-1600
 
  
Phone: 213-825-2543
 
  
 
  
  
Vinton G. Cerf
 
Corporation for National Research Initiatives
 
1895 Preston White Drive, Suite 100
 
Reston, VA 22091
 
  
Phone: 703-620-8990
 
  
 
  
  
Barry Boehm
 
University of California
 
Computer Science Department
 
3732 Boelter Hall
 
Los Angeles, CA 90024-1600
 
  
Phone: 213-825-8137
 
  
+
Postel & Kleinrock & Cerf & Boehm                              [Page 6]

Revision as of 22:52, 22 September 2020




Network Working Group J. Postel (ISI) Request for Comments: 1121 L. Kleinrock (UCLA)

                                                          V. Cerf (NRI)
                                                        B. Boehm (UCLA)
                                                         September 1989


                         Act One - The Poems


Status of this Memo

  This RFC presents a collection of poems that were presented at "Act
  One", a symposium held partially in celebration of the 20th
  anniversary of the ARPANET.  Distribution of this memo is unlimited.

Introduction

  The Computer Science Department of the University of California, Los
  Angeles (UCLA) organized a Symposium on Very High Speed Information
  Networks as the first in a projected series of meetings on Advanced
  Computer Technologies, thus ACT ONE.  The time was chosen to also
  commemorate the 20th anniversary of the installation of the first
  Interface Message Processor (IMP) on the ARPANET which took place at
  UCLA.
  The Symposium took on a theatrical theme and a few of the speakers
  could not resist the temptation to commit poetry.  This memo is an
  attempt to capture the result.

The Poems


                                 WELCOME
                                   by
                            Leonard Kleinrock
  We've gathered here for two days to examine and debate
  And reflect on data networks and as well to celebrate.
  To recognize the leaders and recount the path we took.
  We'll begin with how it happened; for it's time to take a look.
  Yes, the history is legend and the pioneers are here.
  Listen to the story - it's our job to make it clear.
  We'll tell you where we are now and where we'll likely go.
  So welcome to ACT ONE, folks.  Sit back - enjoy the show!!



Postel & Kleinrock & Cerf & Boehm [Page 1]

RFC 1121 Act One - The Poems September 1989


                             ODE TO A QUEUE
                                   by
                            Leonard Kleinrock
                  In the 20 years of funding
                  Many fields has DARPA led.
                  But the finest thing that they did bring
                  Was the analytic thread.
                  By that I mean they nurtured
                  Quantitative research tools.
                  And they always felt for all their gelt
                  They got principles and rules.
                  Indeed a wealth of knowledge
                  Was uncovered and was new.
                  And the common thread with which we led
                  Was the analytic queue!
                  Now a queue may have one server.
                  If there's more, they form a team.
                  Its dearest wish is just to fish
                  In a quiet Poisson stream.
                  If you want to model networks
                  Or a complex data flow
                  A queue's the key to help you see
                  All the things you need to know.
                  So the next time you feel lonely
                  And wonder what to do,
                  You'll soon feel fine if you join the line
                  Of an analytic queue!


                          THE PAST IS PROLOGUE
                                   by
                            Leonard Kleinrock
                  The past is prologue so they say.
                  So Scene 1 was played today.
                  It set the stage to point the way
                  To high speed nets on Friday.
                  And old slow IMP, a costly link,
                  Codes to fix the lines that stink,
                  Ideas born in tanks that think,
                  Tomorrow's distance sure to shrink.


Postel & Kleinrock & Cerf & Boehm [Page 2]

RFC 1121 Act One - The Poems September 1989


                  But first tonight we'll drink and eat.
                  We'll take some time good friends to greet.
                  Hear Bible class from Danny's seat.
                  Those good old days were bittersweet!


                              THE BIG BANG!
                      (or the birth of the ARPANET)
                                   by
                            Leonard Kleinrock
  It was back in '67 that the clan agreed to meet.
  The gangsters and the planners were a breed damned hard to beat.
  The goal we set was honest and the need was clear to all:
  Connect those big old mainframes and the minis, lest they fall.
  The spec was set quite rigid:  it must work without a hitch.
  It should stand a single failure with an unattended switch.
  Files at hefty throughput 'cross the ARPANET must zip.
  Send the interactive traffic on a quarter second trip.
  The spec went out to bidders and t'was BBN that won.
  They worked on soft and hardware and they all got paid for fun.
  We decided that the first node would be we who are your hosts
  And so today you're gathered here while UCLA boasts.
  I suspect you might be asking "What means FIRST node on the net?"
  Well frankly, it meant trouble, 'specially since no specs were set.
  For you see the interface between the nascent IMP and HOST
  Was a confidential secret from us folks on the West coast.
  BBN had promised that the IMP was running late.
  We welcomed any slippage in the deadly scheduled date.
  But one day after Labor Day, it was plopped down at our gate!
  Those dirty rotten scoundrels sent the damned thing out air freight!
  As I recall that Tuesday, it makes me want to cry.
  Everybody's brother came to blame the other guy!
  Folks were there from ARPA, GTE and Honeywell.
  UCLA and ATT and all were scared as hell.
  We cautiously connected and the bits began to flow.
  The pieces really functioned - just why I still don't know.
  Messages were moving pretty well by Wednesday morn.
  All the rest is history - packet switching had been born!




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RFC 1121 Act One - The Poems September 1989


                        ROSENCRANTZ AND ETHERNET
                                   by
                                Vint Cerf
  All the world's a net!  And all the data in it merely packets
  come to store-and-forward in the queues a while and then are
  heard no more.  'Tis a network waiting to be switched!
  To switch or not to switch?  That is the question.  Whether
  'tis wiser in the net to suffer the store and forward of
  stochastic networks or to raise up circuits against a sea
  of packets and, by dedication, serve them.
  To net, to switch.  To switch, perchance to slip!
  Aye, there's the rub.  For in that choice of switch,
  what loops may lurk, when we have shuffled through
  this Banyan net?  Puzzles the will, initiates symposia,
  stirs endless debate and gives rise to uncontrolled
  flights of poetry beyond recompense!


                                UNTITLED
                                   by
                               Barry Boehm
                  Paul Baran came out of the wood
                  With a message first misunderstood
                     But despite dangers lurking
                     The IMP's were soon working
                  And ARPA did see it was good.
                  So in place of our early myopia
                  We now have a net cornucopia
                     With IMP's, TIP's, and LAN's
                     Wideband VAN's, MAN's, and WAN's
                  And prospects of World Net Utopia.
                  But though we must wind up the clock
                  With thoughts of downstream feature shock
                     We all be can mollified
                     For there's no one more qualified
                  To discuss this than Leonard Kleinrock.





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RFC 1121 Act One - The Poems September 1989


Notes

  The Symposium was held August 17 & 18, 1989, a Thursday and Friday.
  "Welcome" was presented on Thursday morning during the Overture.
  "Ode to a Queue" was presented in the Thursday morning session on
  "Giant Steps Forward: Technology Payoffs".
  "The Past is Prologue" was presented at the end of the Thursday
  afternoon sessions.
  "The Big Bang!" was presented during the after dinner events on
  Thursday night.
  "Rosencrantz and Ethernet" was presented at the morning session on
  Friday on "Communication Technologies in the next Millenium" (note
  that this version may differ slightly from the actual presentation
  since it was reconstructed from human memory several weeks later).
  The untitled poem by Barry Boehm was presented in the Friday
  afternoon session on "Impact on Government, Commerce and Citizenry".
  Barry gave his talk on "The Software Challenge to Our Technical
  Aspirations" then introduced the next speaker with this poem.

Security Considerations

  None.

Authors' Addresses

  Jon Postel
  USC/Information Sciences Institute
  4676 Admiralty Way
  Marina del Rey,  CA  90292-6695
  Phone: 213-822-1511
  EMail: [email protected]







Postel & Kleinrock & Cerf & Boehm [Page 5]

RFC 1121 Act One - The Poems September 1989


  Leonard Kleinrock
  University of California
  Computer Science Department
  3732G Boelter Hall
  Los Angeles, CA 90024-1600
  Phone: 213-825-2543
  EMail: [email protected]


  Vinton G. Cerf
  Corporation for National Research Initiatives
  1895 Preston White Drive, Suite 100
  Reston, VA 22091
  Phone: 703-620-8990
  EMail: [email protected]


  Barry Boehm
  University of California
  Computer Science Department
  3732 Boelter Hall
  Los Angeles, CA 90024-1600
  Phone: 213-825-8137
  EMail: [email protected]











Postel & Kleinrock & Cerf & Boehm [Page 6]