Adam Cole (Toronto, Manager Applications and Development for McKesson Canada)
I have always been a proponent of "the user interface is the application". (That is, it doesn't matter what is happening behind the scenes, in most cases an application is judged on it's user interface.)
With this in mind I found the attached article really resonated. The article very tangibly links risk to usability (interface design). In the case of Chernobyl poor design of the control room was a root cause of the reactor's ultimate catastrophic failure.
...Alas I am sorry - one more item to add to your risk assessment checklist.