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To reduce pessimism in cross talk analysis, a key technique that is employed is the use of timing windows. However, timing windows are associated with corners, hence the use of a single corner timing windows during analysis can lead to optimism. Alternately if the timings windows from best and worst corners are combined to create a wider window, it can lead to excessive pessimism. We propose an approach based on parametrized statistical timing analysis modeling to overcome the shortcomings of the existing approaches, and to account for process variations in the defnition of timing windows. We show that this approach can overcome both the issues in the current approaches.