MDS Reports Third Quarter 2007 Results(ncertainties and potential events. We do...),Health

Use of Non-GAAP Measures

In addition to measures based on generally accepted accounting principles (GAAP) in this MD&A, we use terms such as adjusted operating income; adjusted earnings before interest, taxes, depreciation and amortization (EBITDA); EBITDA margin; adjusted EPS; operating working capital; and backlog. These terms are not defined by GAAP and our use of such terms or measurement of such items may vary from that of other companies. In addition, measurement of both reported and organic growth is not defined by GAAP and our use of these terms or measurement of these items may vary from that of other companies. Where relevant, and particularly for earnings-based measures, we provide tables in this document that reconcile the non-GAAP measures used to amounts reported on the face of the consolidated financial statements.

Our executive management team assesses the performance of our businesses based on a review of results comprising these non-GAAP measures and GAAP measures. We also report on our performance to the Company's Board of Directors based on these GAAP and non-GAAP measures. In addition, adjusted EBITDA and operating working capital are the primary metrics for our annual incentive compensation plan for senior management. We provide this non-GAAP detail so that readers have a better understanding of the significant events and transactions that have had an impact on our results and can view our results through the eyes of management.

We also discuss the results of our operations, isolating variances that relate to changes in exchange rates and to acquisitions and divestitures. We use the term "organic" to describe the results presented in this way. To isolate the effect of currency movements, we eliminate the impact of foreign currency hedging activ
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