
If it weren't for some pesky accounting rules, telecom-equipment company Ciena Corp. would have lost a mere 2 cents a share in the fourth quarter. With those accounting rules, it lost 44 cents a share.
The disparity is "the GAAP Gap" - the difference between "pro forma" earnings and earnings prepared according to Generally Accepted Accounting Principles, or GAAP.
GAAP is the nation's accounting standard. Pro forma earnings, by contrast, are governed by no fixed standard. Companies can toss out one-time charges, options expenses, goodwill write-downs - anything that looks bad. One-time windfalls, however, usually manage to stay in.
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