From the perspectives of the senior executive of Mittal and the senior executive of Arcelor, this case looks at post-merger integration. As with many mergers, the ArcelorMittal merger was touted as a "merger of equals." Unlike most, it was actually managed as such and it worked. The case series looks at three critical decision points (one for each case) and challenges that the two senior executives faced from the line organization during the execution of the integration. See ArcelorMittal (A), product #9B10M001 and ArcelorMittal (B), product #9B10M002.