(1) Synopsys manages the business on a long-term, annual basis, and considers quarterly fluctuations of revenue and profitability as normal elements of our business. Quarterly variability, which increases as a result of ASC 606, should be expected. Amounts may not foot due to rounding.

(2) These segment results are consistent with the information required by ASC 280, Segment Reporting. They are presented to reflect the information that is considered by Synopsys' chief operating decision makers (CODMs) to evaluate the operating performance of its segments. The CODMs do not allocate certain operating expenses managed at a consolidated level to our reportable segments, and as a result, the reported operating income and operating margin do not include these unallocated expenses as shown in the table above. Amounts may not foot due to rounding.

(3) Synopsys' fourth quarter of fiscal year 2020 ended on October 31, 2020, and its fiscal year 2019 ended on November 2, 2019. For presentation purposes, we refer to the closest calendar month end.