When Interfaces kill: what happen to John Denver

I came across this interesting article by Bruce Tognazzini (
http://www.asktog.com/tog.html) while browsing the net. It's title is "When
Interfaces kill: what happen to John Denver"...

Link: http://www.asktog.com/columns/027InterfacesThatKill.html

Below is a snippet from the article....

"Making things worse

*The fuel:* Denver had three ways to ensure he had enough fuel. Evidence
suggests he made use of two of them:

1. He had fuel gauges in the rear of the aircraft, behind the pilot,
and a mirror (!) used to look at them. However, the fuel gauges were not
linear and had no markings to indicate that apparently half-full was really
close to empty.
2. ..."

Regards,
AmAn

Design Researcher
Motorola Research Labs India