It was a critical error from Hamilton, who was fuelled to make his first pit stop a lap earlier than Raikkonen.

BBC: Hamilton stripped of Belgian win

If he makes a critical error it might change your strategy.

BBC: Padraig Harrington Q&A

As resources dwindled, manpower-intensive caucus states were abandoned in favor of delegate-rich primary battlegrounds, a critical error that allowed Obama to amass a pledged delegate lead that Clinton was never able to overcome.

CNN: Analysis: Why Clinton's bid failed

While Iomega has done a good job of building its Zip disk brand over the past several years, it made a critical error when it reduced the prices on the drive and pinned its hopes for a long-term revenue stream on sales of disks.

FORBES: Ten O'Clock Tech: Iomega Breaks From The PC

Even though Iomega won the battle of removable storage--it bought out the assets of its main rival, the bankrupt SyQuest , in late 1998--and its Zip drive is a de facto standard for PCs, Porter says the company made a critical error by selling the drives at a low margin, thinking profits would come from the sale of the disks.

FORBES: Iomega Hopes The Music Will Go On

Neurologist Antonio Damasio, a professor at the University of Iowa College of Medicine, suggests in his book Descartes' Error that emotion is critical to effective thinking and decision making.

FORBES: On The Cover/Top Stories

"A critical portion of our energy industry is operating with no margin for error, "U.S. Rep.John Shadegg, R-Ariz.

FORBES: Magazine Article