> We are beginning to customize our z./OS 1.7 (to 
> replace 1.4).   We have several folks who will be 
> updating parmib and proclib.  There is a possibility 
> that we might step on each other's changes.  Say, 
> for instance, two people are making changes to COMMNDxx. 

At my last job, I was the "parmlib nazi".  All changes to
parmlib went to me (except off hours to fix a problem).   IMHO,
there should only be one person updating the parmlib.  You
always want the system to IPL.  For example for Audits, there
was only one person making changes to the APF list. 

Regardless of if it's one person or many updating the parmlib, I
would recommend using a parmlib concatenation.  See what I did
here: 

   
http://www.planetmvs.com/userexperiences/os390r6.html#parmlib

Put the new parmlib dataset that contains all changes just for
the new operating system in front of your current concatenation.
  All of the changes go there instead of your production
libraries so you never cause a problem to your current system. 

I don't know if its on that web page but I also create a system
symbol like "&OSLEVEL" with the value like "ZOS17".   There
would be a LNKLST library with a name like
SYS2.&OSLEVEL..LINKLIB for modules that are needed just for the
new operating system.  

One place I worked had a third SYSRES, &SYSR3, which was for
program products and had the updated libraries to match that
level of the operating system.   That makes it nice to bring in
everything needed for that level of the OS.  

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