Personally I don’t think it was the use of FOCEI that led to NONMEM taking off, 
it was that you could run it on personal computers, which were just starting to 
be powerful enough to handle to computational load.  This was back when 
computers had numbers for names, like 386 and 486.  I think this started with 
NONMEM IV.

There was a history of NONMEM webpage that Icon maintained, but when I checked 
today, it no longer looks like it is functional.

https://nonmem.iconplc.com/nonmem_history/NONMEM_history4.pdf

Pete Bonate



Peter Bonate, PhD
Suzerain, New Technologies
Early Development
Astellas
2375 Waterview Drive
Northbrook, IL  60062
peter.bon...@astellas.com<mailto:peter.bon...@astellas.com>
(224) 619-4901

From: owner-nmus...@globomaxnm.com <owner-nmus...@globomaxnm.com> On Behalf Of 
Eleveld, DJ
Sent: Wednesday, December 4, 2024 5:39 AM
To: nmusers <nmusers@globomaxnm.com>
Subject: [NMusers] Historical question

Hi All, I am writing a paper on some C language code I have written that does 
FOCE. I want to write a few sentences about the history of NONMEM but I’m not 
100% sure it is correct. Can someone knowledgeable give me some feedback on 
this?

Hi All,

I am writing a paper on some C language code I have written that does FOCE.
I want to write a few sentences about the history of NONMEM but I’m not 100% 
sure it is correct.
Can someone knowledgeable give me some feedback on this?

“NONMEM software was developed at USCF in the late 1970s and became the 
de-facto industry standard when the first-order-conditional estimation with 
interaction (FOCE-I) method reaching wide use in the field. NONMEM was open 
source until version 5 when the rights were obtained by Icon PLC and it became 
encrypted-source. The investment of Icon PLC has resulted in considerable 
NONMEM development with many bug-fixes and new features available in current 
version 7.5.1. ”

Warm regards,

Douglas Eleveld
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