@JJJohn (or, if you like, Robert) ... I know that you like acronyms, but is there any chance of telling us lesser folk what some of them actually mean?

1) CQC
2) ESR
3) OLM
4) NHSLA

... and any other worthy of mention. think

@Robert: the army has used the Aid Memoire for many years. But I always preferred that course "hand-outs" (course notes, précis ... whatever) were only given out at the end of proceedings.

Meanwhile, we used to encourage participation as the instruction (tuition, mentoring) progressed, if only amounting to having students fill up their own notebooks (and I'm talking about pens and paper here, not electronic toys) ... rather than (for instance) dozing in the their chairs, yawning, playing with their Smart Phones ... or otherwise wasting everybody's time. whistle

Hopefully, John [and some others who get on here] will also remember the "line follow-through diagrams" that we were encouraged (?) to provide for ourselves. Bits of card, or pocket notebooks, with lines showing test point connections - for continuity and/or voltage (generally just the single line, with voltages to be tested WRT "earth"). But the important thing was that each test point had to be accessible in reality on the equipment itself (eg, at a junction box, or whatever), rather that just being a "notional" point on a circuit diagram. Practical ideas like that were handed down from earlier generations of techs, based upon hard-earned lessons learned "in the field" (often literally). After a while, all you needed was your notebook or sheaf of cards (held together by a high-tech elastic band, usually), your bag of tools ... and of course, your AVO! It's a technique that I continued to use from time to time in more recent years (well, I remember doing one in 1996, at least)!