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ABCs of z/OS System Programming Volume 8 by Peter Hilger, Paul Rogers

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z/OS problem diagnosis fundamentals
There should be a staff of people who diagnose software problems that occur while running the operating system. These people are usually system programmers for the installation.
If an installation does not wish to debug the problem or does not have the source code involved in the problem, use a diagnostic procedure to collect the problem data needed for reporting the problem to IBM. IBM will debug the problem and provide a fix.
If an installation wishes to debug the problem and has the source code, use a diagnostic ...

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