Looks like you're focusing on things that do work - well, other than Data Spaces and (my own opinion) Subsystems, which I tend to think of as control blocks and not anything that does actual work (not counting any related subsystem STC). Have you seen the "ABCs of IBM z/OS System Programming" Redbooks?

On 11/6/2018 10:59 AM, Peter Ten Eyck wrote:
For an inquisitive programmer... what is a good definition for each of the 
following? How do they relate to each other?

Address space
Data space
Subsystem
Started task
Job
TSU (TSO)
Process
Enclave

Note: My explanation will fall short of what IBM-Main can come up with.

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