My very sincere thanks to Simon Powers for posting the ‘onion diagram’ in his ‘What is Agile?’ post on LinkedIn and for answering my question. The post is also available on his own blog http://www.adventureswithagile.com/2016/08/10/what-is-agile/
It shows ‘tools & processes’ separate from ‘practices’. I’ve been thinking for a long time about whether there is any real difference between process (what) and procedure (how) or if they are simply different levels of detail. I think I’ve just been convinced that the equation I’ve been searching for is:
Simon actually listed in his answer to me, ‘
I think making the process one of the practises would make the function recursive and this is supposed to be one of my Lisp rest-days. If my process diagram shows roles or artifacts then I’m sure I’ve moved into the realm of specifying practice. Interactions may be input-output that is part of the definition of the process, so it is probably necessary to split them down more, into message type & format.