Management uses these non-GAAP measures for internal reporting and forecasting purposes, when publicly providing its business outlook, to evaluate the Company's performance and to evaluate and compensate the Company's executives. The Company has provided these non-GAAP financial measures in addition to GAAP financial results because it believes that these non-GAAP financial measures provide useful information to certain investors and financial analysts for comparison across accounting periods not influenced by certain non-cash items that are not used by management when evaluating the Company's historical and prospective financial performance. In addition, the Company has historically provided this or similar information and understands that some investors and financial analysts find this information helpful in analyzing the Company's operating margins, operating expenses and net income and comparing the Company's financial performance to that of its peer companies and competitors.Management typically excludes the amounts described above when evaluating the Company's operating performance and believes that the resulting non-GAAP measures are useful to investors and financial analysts in assessing the Company's operating performance due to the following factors: • The Company does not acquire businesses on a predictable cycle. The Company, therefore, believes that the presentation of non-GAAP measures that adjust for the impact of amortization and certain stock-based compensation expenses and the related tax effects that are primarily related to acquisitions, provide investors and financial analysts with a consistent basis for comparison across accounting periods and, therefore, are useful to investors and financial analysts in helping them to better understand the Company's operating results and underlying operational trends. • Amortization costs and the related tax effects are fixed at the time of an acquisition, are then amortized over a period of several years after the acquisition and generally cannot be changed or influenced by management after the acquisition. • Although stock-based compensation is an important aspect of the compensation of the Company's employees and executives, stock-based compensation expense is generally fixed at the time of grant, then amortized over a period of several years after the grant of the stock-based instrument, and generally cannot be changed or influenced by management after the grant.