This excerpt taken from the HPQ 8-K filed Aug 18, 2009.
Usefulness of Non-GAAP Financial Measures to Investors
HP believes that providing non-GAAP operating profit, non-GAAP operating margin, non-GAAP net earnings, non-GAAP diluted earnings per share and gross cash to investors in addition to the related GAAP measures provides investors with greater transparency to the information used by HP’s management in its financial and operational decision-making and allows investors to see HP’s results “through the eyes” of management. HP further believes that providing this information better enables HP’s investors to understand HP’s operating performance and to evaluate the efficacy of the methodology and information used by management to evaluate and measure such performance. Disclosure of these non-GAAP financial measures also facilitates comparisons of HP’s operating performance with the performance of other companies in HP’s industry that supplement their GAAP results with non-GAAP financial measures that are calculated in a similar manner.