A Closer Look  In 1970, as the Apollo 13 spacecraft hurtled
toward the moon, one line of data buried on a Mission Control
display screen could have alerted NASA ground controllers to the
oxygen tank problem that led to the spacecraft's aborted moon
landing and dramatic, jury-rigged reentry. If Mission Control in
Houston had noticed the error code, they could have alerted the
astronauts that pressure in the spacecraft's oxygen tanks was
dangerously building and possibly intervened before the problem
reached a critical level-forcing the astronauts to abandon their
mission and return to Earth in a "lifeboat" craft.  As it was,
though, the key piece of alphanumeric code was hidden on a
screen that was so full of information that it was overlooked,
says engineering psychologist Michael Matthews, PhD.  "I don't
consider that accident to be human error per se," says Matthews,
an engineering psychology professor at West Point Military
Academy. "It was a design error, a contributing factor to the
accident, along with