ERT's non-GAAP effective tax rates differ from its GAAP effective tax rates because of 1) the exclusion of the amortization of acquired intangible and other assets and acquisition and other costs related to its acquisition of RS and 2) the income tax effect due to the difference between the GAAP and non-GAAP effective tax rate applied against the GAAP pre-tax income, primarily as a result of the acquisition costs incurred in 2010 not being deductible for income tax purposes. ERT excludes the impact of these discrete tax items from its non-GAAP income tax provision because it believes they are not indicative of the effective income tax rate of its ongoing business operations.
Management uses these non-GAAP financial measures, in addition to the measures prepared in accordance with GAAP, as the basis for measuring ERT's operating performance, financial and operating decision-making, developing budgets and comparing such performance to that of prior periods for the same reasons stated above. These non-GAAP financial measures are not meant to be considered superior to or a substitute for comparable financial measures prepared in accordance with GAAP. There are also limitations on the non-GAAP measures, including: 1) these non-GAAP measures do not have standardized meanings and may not be comparable to similar non-GAAP measures used by other companies, 2) acquisition and other costs related to ERT's 2010 acquisition of RS represent actual c
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