Do the poka-yoke: building error proof software

I would say that the US&#x2F;EU plugs which are symmetric are more resilient than AU plug: with AU plug, an electrician can connect wires the wrong way, yet with EU&#x2F;US plug there is no wrong way: devices handle either polarity because the sockets and plugs are symmetric.<p>US plug has a drawback that there could be a live connection with exposed prongs, similar to two pronged EU plugs: both apply with flat sockets (eg. you may touch the exposed pins).

The example is not a poka yoke.<p>A poka yoke is an implement that prevents or calls attention to an error state. It&#x27;s shaping objects so that they can only be inserted a certain way, it&#x27;s a flexible barrier that bumps against tall vehicles before they hit the tunnel entrance.<p>An enum is not that, I think.

TBH, this doesn&#x27;t sound more useful than saying &quot;make mistakes impossible&quot;.<p>No surprise it hasn&#x27;t caught up outside Japan like &quot;kanban&quot;, &quot;lean&quot;, &quot;stop-the-line&quot; etc have.