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From: john larkin <jl@glen--canyon.com>
Newsgroups: sci.electronics.design
Subject: Re: "RESET"
Date: Fri, 06 Jun 2025 06:40:44 -0700
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On Fri, 06 Jun 2025 13:45:02 +0200, albert@spenarnc.xs4all.nl wrote:

>In article <101p8sd$phe5$1@dont-email.me>,
>David Brown  <david.brown@hesbynett.no> wrote:
><SNIP>
>>I recall something of the opposite - a long time ago, we had to add a
>>variety of "safety" features to a product to fulfil a customer's safety
>>/ reliability checklist, without regard to how realistic the failure
>>scenarios were and without spending time and money on analysis.  The
>>result was, IMHO, lower reliability because it was more likely for the
>>extra monitoring and checking hardware and software to fail than for the
>>original functional stuff to fail.  Many of these extra checks were in
>>themselves impossible to test.
>
>I worked on the Dutch railway systems safety and control software.
>Once they added external control checking.
>I've seen the code. In places there was an 8 level indentation
>caused by if's switches and loops.
>
>There was also a ban on automatic testing. I got on a row, because
>I used a 3 line batch file (.BAT) to save on repetitive typing.
>
>Groetjes Albert

The advantage of a state machine is that it forces people to know the
state of the system.