Calculation of EBITDA
EBITDA is a supplemental financial measure not defined in generally accepted accounting principles, or GAAP. The company defines EBITDA as net income attributable to Foster Wheeler AG before interest expense, income taxes, depreciation and amortization. The company has presented EBITDA because it believes it is an important supplemental measure of operating performance. Certain covenants under our senior unsecured credit agreement use an adjusted form of EBITDA such that in the covenant calculations the EBITDA as presented herein is adjusted for certain unusual and infrequent items specifically excluded in the terms of our senior unsecured credit agreement. The company believes that the line item on its consolidated statement of operations entitled "net income attributable to Foster Wheeler AG" is the most directly comparable GAAP financial measure to EBITDA. Since EBITDA is not a measure of performance calculated in accordance with GAAP, it should not be considered in isolation of, or as a substitute for, net income attributable to Foster Wheeler AG as an indicator of operating performance or any other GAAP financial measure.
EBITDA, as calculated by the company, may not be comparable to similarly titled measures employed by other companies. In addition, this measure does not necessarily represent funds available for discretionary use, and is not necessarily a measure of the company's ability to fund its cash needs. As EBITDA excludes certain financial information that is included in net income attributable to Foster Wheeler AG, users of this financial information should consider the type of events and transactions that are excluded.
The company's non-GAAP performance measure, EBITDA, has certain material limitations as follows:• It does not include interest expense. Because the company has borrowed money to finance some of its operations, interest is a necessary and ongoing part of its costs and has assisted the company in generating revenue. Therefore, any measure that excludes interest expense has material limitations;