A decade of process improvement has transformed the way corporations operate. With such change has come an equally broad transformation in the job of the senior executive. Top-down autocrats are out and bottom-up teams are in. The CEO as hero is giving way to Team Xerox and Team Taurus. To hear some executives tell it, the traditional hands-on role of the senior manager is disappearing. The message seems to be: Get the processes right, and the company will manage itself.