I would have lamented screen casts of a workflow or a few. And show it to them and say let's say if this was a UI for launching a missile, what would you change?
And then make it miss a fundamental UX principle like undo destructive actions.
Another scenario might be a confusing factory scenario that involves picking items and shipping them, and a need to go back. Kind of like amazons fulfillment centers or shipping a UPS package.
And then miss the key fundamental UX principles, like keeping the user informed of the system state.
Another option which takes way less prep work is Google or Bing for terrible user interfaces, show them to them and ask them what they would change and why.
It's not that easy then show them a great UI and ask them what they would change.
I answered this from a diner so if want to give it more thought but here's the scenarios for the great UIs.
- Show them one of your UIs to actually get some feedback
- You could show them a UI they probably know well like Facebook or gmail because maybe they already have idea on what to change but you will be surprised how many people never thought about what to change on apps they use every day.
- Show them a great ui they probably never have seen before like something with CRM or something foreign.
Not sure which one of 1-3 I like the most.
Another option is have them draw a UI
Have them design a UI to do something. And see what principles they talk about and mention. This may not be the best to coach up an HR person to do, but you can do it. Make sure to have 3 or 4 UIs you cycle through so people on line don't hear the design an egg timer and they are thinking about it for 45 mins while the first guy only had 10 minutes.